Patent Description:
Sandals placed outdoor, such as a veranda and a garden, get wet in rain or dust attaches to the sandals to get dirty. In view of this, each time the sandals are worn, inside of the sandals needs to be dried or wiped with, for example, a dustcloth, which is troublesome. Use of a storage box and a cover case storing the sandals to avoid attachment of rain and dust beforehand is considered. However, in this case, in addition to a location to place the storage box or the like being required, housing and taking out the sandals are troublesome.

Therefore, the following Patent Literature <NUM> proposes a configuration of standing sandals with which, without use of a storage box or the like, wet and dirt of an inside of the sandals due to rain and dust are avoided beforehand, and thus a labor, such as wiping and drying, is unnecessary.

<CIT> discloses sandals configured to protect the feet from water splashes, puddles, wet grass and wind.

However, even when the above-described standing sandals are stood and placed, inner surfaces, which are surfaces in contact with feet of a person who wears the sandals, are remained to be exposed. In view of this, completely avoiding dirt of the inner surfaces of the sandals caused by, for example, wet due to, for example, rain and attachment of dust is difficult. That is, especially, under the condition where a side wind blows from opening sides of the sandals that are stood and placed, the above-described standing sandals have a possibility of getting wet or dirty of the surfaces (especially regions of heel parts) in contact with the feet of the person who wears the sandals.

In consideration of the above-described points, an object of the present invention is to provide a footwear in which wet and dirt of surfaces in contact with feet of a person who wears the footwear is further reliably avoided even when the footwear is placed outdoor without use of a storage box or the like, and a labor of wiping and drying the surfaces is unnecessary, and a method for manufacturing the footwear.

The present invention is a footwear for wrapping an entire foot. The footwear includes a main body and an embedded part made of synthetic rubber.

The main body is made of foam rubber. The main body is dug to embed synthetic rubber into a heel side of a bottom of the main body made of the foam rubber. The embedded part is a part from a mid-point from a toe to a heel to a heel part of the bottom of the main body. Specific gravities of the foam rubber and the synthetic rubber are <NUM>/cm<NUM> and <NUM>/cm<NUM>, respectively. A center of gravity of the footwear is shifted to the heel side using a difference in the specific gravity of both to increase stability such that the footwear does not fall over when the footwear is placed upside down. An opening of the footwear is further formed to be flat with respect to a ground surface when the footwear is placed upside down.

Further, the opening of the footwear may have a width in a right-left direction widened more than a width in a direction perpendicular to the right-left direction for stabilization against a side wind received by a side surface of the footwear. The synthetic rubber may be embossed for a slip resistance.

The present invention is a method for manufacturing the footwear that wraps an entire foot and is allowed to be placed upside down to avoid an inside of the footwear to get dirty with rain and dust. The method includes: a step of manufacturing the footwear having an opening with a flat shape with foam rubber having a specific gravity of <NUM>/cm<NUM>; a step of subsequently digging a part from a mid-point from a toe to a heel to a heel part as a part of a bottom of the footwear manufactured with the foam rubber; and a step of subsequently fitting synthetic rubber having a specific gravity of <NUM>/cm<NUM> in a dug groove. A center of gravity of the footwear is set in a heel side using a difference in the specific gravity.

With the footwear of the present invention, since the opening is formed to be flat with respect to the ground surface and the center of gravity is positioned on the heel side, by placing the footwear upside down, the footwear can be placed in a stable posture so as to close the opening. Accordingly, according to the present invention, the footwear in which wet and dirt of an inner surface is reliably avoided beforehand and a labor, such as wiping and drying the inner surface each time the footwear is used, is unnecessary by only placing the footwear upside down can be provided. Additionally, the footwear can be easily manufactured.

The following describes embodiments of the present invention with reference to the drawings. Note that the present invention is not limited to these embodiments. In addition, the drawings include parts expressed by appropriately changing scales, for example, partially enlarged or highlighted. The drawings illustrate only one of footwears used as a left and right pair. Since the other one has a similar configuration, the illustration is omitted. <FIG> illustrates an example of a footwear <NUM> according to an embodiment, <FIG> is a perspective view, and <FIG> is a drawing illustrating an example of a use state of the footwear.

The footwear <NUM> is a footwear used when, for example, a person goes outdoor. As illustrated in <FIG>, the footwear <NUM> includes an opening <NUM> and an internal space <NUM> that houses a foot F of the person. For example, the person who is in bare feet or wears socks directly wears the footwear <NUM> for use, and as illustrated in <FIG>, the footwear <NUM> is used with the entire foot F of the person wrapped. Similarly to general sandals or the like, the footwear <NUM> is assumed to be used when the person does not go for outing, such as going to a veranda and going to a garden from a back door, and to be placed upside down at an outdoor location, such as a doorway of a veranda and outside a back door, while not used. Note that the footwear <NUM> in <FIG> is for a right foot, a footwear for a left foot (not illustrated) paired to the footwear <NUM> also has the configuration similar to the footwear <NUM>, and, for example, configured to be symmetrical to the footwear <NUM>.

<FIG> illustrates the footwear <NUM> in <FIG>, <FIG> is a plan view, <FIG> is a cross-sectional view along the line A-A in <FIG> is a bottom view. As illustrated in <FIG>, the footwear <NUM> is constituted including a foam rubber portion <NUM> made of foam rubber and a synthetic rubber portion <NUM> made of synthetic rubber.

The foam rubber portion <NUM> forms a shape of the footwear, and constitutes the main part of the footwear <NUM>. As described above, the foam rubber portion <NUM> includes the opening <NUM> and the internal space <NUM>, and includes a bottom portion <NUM> as a part of a bottom of the footwear <NUM>, an upper portion <NUM> as a part of an upper of the footwear <NUM>, a toe portion <NUM> as a part of a toe of the footwear <NUM>, and a heel portion <NUM> as a part of a heel of the footwear <NUM> constituting them.

The opening <NUM> is formed such that the foot F of the person can be inserted into and removed from the internal space <NUM>. A width W1 in a right-left direction of the opening <NUM> is configured to be smaller (shorter) than a width W2 in a direction perpendicular to the width W1 direction.

In a lower surface 11a of the bottom portion <NUM>, a depressed portion 11b in which a part of a region is depressed is formed (see <FIG>). The depressed portion 11b is formed such that the synthetic rubber portion <NUM> can be disposed inside, and has a predetermined depth. Accordingly, the formation region of the depressed portion 11b in the lower surface 11a of the bottom portion <NUM> and the shape and the depth of the depressed portion 11b are formed according to the position in the lower surface 11a of the synthetic rubber portion <NUM> and the shape and the thickness of the synthetic rubber portion <NUM>. The depressed portion 11b in <FIG> is formed in the region on the heel portion <NUM> side of the lower surface 11a in a direction L from the toe portion <NUM> side toward the heel portion <NUM> side. The depressed portion 11b is formed to have an approximately semicircular shape having a linear part on the toe portion <NUM> side and an arc part on the heel portion <NUM> side so as to match the shape of the synthetic rubber portion <NUM> described later.

<FIG> illustrates the footwear <NUM>, <FIG> is a drawing when the footwear <NUM> is viewed in the slightly oblique direction, and <FIG> is a side view illustrating a state of placing the footwear <NUM> upside down. As illustrated in <FIG>, an end surface (an opening end surface) <NUM> of the opening <NUM> abuts on a placed surface C when the footwear <NUM> is placed upside down, and thus the opening end surface <NUM> is formed to ensure stably supporting the entire footwear <NUM>. When the footwear <NUM> is placed upside down, the opening end surface <NUM> entirely abuts on the surface C. In this state, the toe portion <NUM> of the footwear <NUM> is stabilized while a predetermined interval is held with respect to the surface C. Note that in this Description, the surface C when the footwear <NUM> is placed upside down is defined and used as a "ground surface. " The ground surface C is mainly a ground, but includes, for example, a veranda floor. The specific configuration of the opening end surface <NUM> is as follows.

As described above, the opening end surface <NUM> is a plane formed to entirely abut on the ground surface C. That is, the opening end surface <NUM> is flush with and parallel to the plane equivalent to the ground surface C. <FIG> illustrates the opening end surface <NUM> of the footwear <NUM> and is a drawing when the footwear <NUM> is viewed in the slightly oblique direction. When the footwear <NUM> is placed similarly to a general footwear (that is, when the footwear <NUM> is placed while the upper portion <NUM> faces upward and the bottom portion <NUM> faces downward), as illustrated in <FIG>, the opening end surface <NUM> is inclined with respect to a horizontal surface H to gradually rise from the heel portion <NUM> side toward the upper portion <NUM> side. In view of this, when the footwear <NUM> is placed upside down, compared with a case of the opening end surface <NUM> being a horizontal surface, the position of the center of gravity of the footwear <NUM> moves in a direction from the toe portion <NUM> side toward the heel portion <NUM> side. Accordingly, the opening end surface <NUM> having the inclined surface improves the stability of the footwear <NUM> placed upside down and avoids the upside-down footwear <NUM> to fall over toward the toe portion <NUM> side.

An angle (an inclined angle) θ formed by the horizontal surface H and the opening end surface <NUM> is configured according to, for example, the shapes and the weights of the toe portion <NUM> and the upper portion <NUM>. However, when the angle θ is a comparatively small and the inclination is gentle (for example, the angle θ of less than <NUM>°), the meaningful effect brought by the inclination cannot be obtained, and the footwear <NUM> placed upside down is likely to fall over toward the toe portion <NUM> side and therefore is unstable. On the other hand, when the angle θ is comparatively large and the inclination is steep (for example, the angle θ in excess of <NUM>°), the rise of the position of the center of gravity of the upside-down footwear <NUM> makes the footwear <NUM> unstable conversely. That is, in this case, the problem of the decrease in stability caused by the upward movement of the position of the center of gravity is more serious than the effect brought by moving the position of the center of gravity of the footwear <NUM> placed upside down in the direction from the toe portion <NUM> side toward the heel portion <NUM> side. Therefore, the angle θ is set to, for example, from <NUM>° to <NUM>°. In this case, while the decrease in stability caused by the rise of the position of the center of gravity of the upside-down footwear <NUM> is suppressed, the meaningful effect brought by the inclination can be provided. Note that when the footwear <NUM> is placed similarly to a general footwear, the opening end surface <NUM> is not limited to be the plane inclined with respect to the horizontal surface H, and may be a plane parallel to the horizontal surface H.

<FIG> is a plan view illustrating the opening end surface <NUM>. As illustrated in <FIG>, the opening end surface <NUM> has an approximately circular ring shape region formed along the opening <NUM> at a predetermined width. This disperses the contact surface between the opening end surface <NUM> of the footwear <NUM> placed upside down and the ground surface C in a balanced manner, and ensuring the contacted area stably supports the upside-down footwear <NUM>.

Additionally, a width W3 in the right-left direction of the opening end surface <NUM> is configured smaller (narrower) than a width W4 (see <FIG>) in a direction perpendicular to the width W3 direction. That is, the width W4 is configured to be larger (wider) than the width W3 in the right-left direction. Additionally, the width W3 in the right-left direction of the opening end surface <NUM> is configured to be larger (wider) than a width W5 in the right-left direction of the upper portion <NUM> and the toe portion <NUM>. This configuration further reliably avoids the upside-down footwear <NUM> to fall over toward the toe portion <NUM> side.

The foam rubber portion <NUM> is integrally formed by foam rubber. The foam rubber constituting the foam rubber portion <NUM> is rubber containing soft foam and soft rubber internally having many voids. As the soft rubber, for example, ethylene vinyl acetate rubber, polyethylene rubber, or silicon rubber is used. A specific gravity of the foam rubber portion <NUM> is set to be <NUM>/cm<NUM>.

Referring again to <FIG>, the synthetic rubber portion <NUM> is disposed on the bottom surface (the surface on the lower side) of the footwear <NUM> in a state where a part of the synthetic rubber portion <NUM> is housed in the depressed portion 11b so as to be fitted to the depressed portion 11b. The synthetic rubber portion <NUM> is disposed in the region on the heel portion <NUM> side in the direction L from the toe portion <NUM> side toward the heel portion <NUM> side on the lower surface 11a of the foam rubber portion <NUM>. That is, the position where the synthetic rubber portion <NUM> is disposed on the lower surface 11a of the foam rubber portion <NUM> is the position on the heel portion <NUM> side with respect to a position of a center T (see <FIG>) between the heel portion <NUM> and the toe portion <NUM>.

The synthetic rubber portion <NUM> is a plate-shaped member that is approximately parallel to the bottom surface of the footwear <NUM>, and has a top surface <NUM>, which is the main surface, as a joined surface joined to a bottom surface 11c of the depressed portion 11b. The synthetic rubber portion <NUM> has a thickness configured slightly larger (slightly longer) than the depth of the depressed portion 11b. In view of this, in the footwear <NUM>, a lower surface (the main surface on the side opposite to the top surface <NUM>) <NUM> of the synthetic rubber portion <NUM> slightly projects downward from the lower surface 11a of the foam rubber portion <NUM>. The lower surface <NUM> of the synthetic rubber portion <NUM> constitutes the bottom surface of the footwear <NUM> together with the lower surface 11a of the foam rubber portion <NUM>. The synthetic rubber portion <NUM> is not limited to have the plate shape, and may have, for example, a block shape and a film shape.

As illustrated in <FIG>, the synthetic rubber portion <NUM> is formed in an approximately semicircular shape having a linear part on the toe portion <NUM> side and an arc part on the heel portion <NUM> side. The lower surface <NUM> of the synthetic rubber portion <NUM> is embossed, and the lower surface <NUM> has a plurality of grid-like projecting portions <NUM> formed so as to appear on the lower surface <NUM> by embossing process. The projecting portions <NUM> make the lower surface <NUM> of the synthetic rubber portion <NUM> less likely to slip. Note that the projecting portions <NUM> formed so as to appear on the lower surface <NUM> by embossing process is not limited to have the grid pattern, and any shape may be used. For example, the projecting portions <NUM> may have a shape of a plurality of lines extending in the right-left direction or the front-rear direction of the footwear <NUM> or a plurality of dots, or may have a shape in which a drawing or a sign appear. By thus embossing the lower surface <NUM> of the synthetic rubber portion <NUM>, the footwear <NUM> provides the slip resistance effect during use. Note that whether the lower surface <NUM> of the synthetic rubber portion <NUM> is embossed is optional. When the embossing process is not performed, the lower surface <NUM> may be, for example, a plane or a curved surface or may have a groove, a wave shape, or the like.

The synthetic rubber portion <NUM> is integrally formed by synthetic rubber. The synthetic rubber constituting the synthetic rubber portion <NUM> is artificial rubber manufactured from, for example, petroleum and naphtha. For example, as the synthetic rubber, silicon rubber, acrylic rubber, and urethane rubber are used. A specific gravity of the synthetic rubber portion <NUM> is set to be <NUM>/cm<NUM>.

Note that the synthetic rubber portion <NUM> is not limited to have the above-described shapes. For example, the synthetic rubber portion <NUM> may have a block shape instead of the plate shape, and may be a plate-shaped member approximately perpendicular to the bottom surface of the footwear <NUM>. In this case, as described above, the depressed portion 11b is formed in the shape according to the shape of such a synthetic rubber portion <NUM>. For example, when the synthetic rubber portion <NUM> has the plate shape approximately perpendicular to the bottom surface of the footwear <NUM>, the depressed portion 11b is formed in the groove shape into which the plate-shaped synthetic rubber portion <NUM> is insertable from its width direction (the direction perpendicular to the thickness direction), and one end surface in the width direction of the synthetic rubber portion <NUM> is embossed.

The above-described footwear <NUM> is the footwear for wrapping the entire foot that includes the main body <NUM> (see <FIG>) made of foam rubber. The main body <NUM> is dug to embed the synthetic rubber into the heel side of the bottom <NUM> of the main body <NUM> made of the foam rubber. The embedded part is a part from the center T between the toe and the heel to the heel part of the bottom <NUM> of the main body <NUM>. The specific gravities of the foam rubber portion <NUM> and the synthetic rubber portion <NUM> are <NUM>/cm<NUM> and <NUM>/cm<NUM>, respectively. The position of the center of gravity of the footwear <NUM> is shifted to the heel portion <NUM> side using a difference in the specific gravity of both to increase stability such that the footwear <NUM> does not fall over toward the toe portion <NUM> side when the footwear <NUM> is placed upside down. Further, the opening of the footwear is formed to be flat with respect to the ground surface C when the footwear <NUM> is placed upside down.

When the footwear <NUM> is placed upside down, the opening end surface <NUM> abuts on the ground surface C so as to close the internal space <NUM> and the footwear <NUM> is in the stable state without falling over. In view of this, placing the footwear <NUM> upside down outdoor by a user without use of, for example, a storage box allows reliably avoiding invasion of rain and dust into the internal space <NUM> beforehand. Accordingly, with the footwear <NUM>, while the user does not use the footwear <NUM>, only placing the footwear <NUM> upside down allows easily and reliably avoiding wetting and dirtying an inner surface 2a (see <FIG>) of the footwear <NUM>. Eventually, this eliminates the need for a labor, such as wiping and drying the inner surface 2a each time the footwear <NUM> is used.

Next, an example of a method for manufacturing the footwear <NUM> will be described with reference to the drawings. <FIG> is a flowchart for describing an example of the method for manufacturing the footwear <NUM>. <FIG> is a drawing for describing a part of steps of the manufacturing process of the footwear <NUM>, <FIG> is a cross-sectional view illustrating the main body <NUM>, <FIG> is a cross-sectional view illustrating the foam rubber portion <NUM>, and <FIG> is a cross-sectional view illustrating the foam rubber portion <NUM> and the synthetic rubber portion <NUM>. Note that the respective cross-sectional views of <FIG> are cross-sectional views along the line equivalent to the line A-A in <FIG>. The following describes an example of the method for manufacturing the footwear <NUM> based on the flowchart in <FIG>.

As illustrated in <FIG>, the main body <NUM> is manufactured (Step S01). Here, as illustrated in <FIG>, the main body <NUM> has the configuration identical to the foam rubber portion <NUM> excluding a point that the depressed portion 11b is not disposed in a lower surface <NUM>.

This step is performed by, for example, injection molding. In this step, first, a mold (for example, a metal mold) having the shape of the main body <NUM> is prepared, and then a molten resin injected into the mold to fill the form. Afterwards, the mold is removed. Thus, the main body <NUM> made foam rubber having a void structure is manufactured.

Next, the bottom <NUM> of the main body <NUM> is dug (Step S02).

In this step, as illustrated in <FIG>, a predetermined region of the bottom <NUM> of the main body <NUM> is dug to form the depressed portion 11b. The digging step of the bottom <NUM> is performed by mechanical processing, such as a cutting work, and processing, such as addition of heat, a medical product, or the like for melting and removal. In view of this, the foam rubber portion <NUM> as illustrated in <FIG> is completed.

Additionally, separately from the above-described Step S01 and Step S02, a synthetic rubber main body (not illustrated) is manufactured (Step S11). Here, the synthetic rubber main body has the configuration identical to the synthetic rubber portion <NUM> excluding a point that the above-described embossing process is not performed on the lower surface <NUM>. That is, the synthetic rubber main body is equivalent to the synthetic rubber portion <NUM> before being embossed.

This step is performed by, for example, injection molding. In this step, first, a mold (for example, a metal mold) having the shape of the synthetic rubber main body is prepared, and then a molten resin injected into the mold to fill the form. Afterwards, the mold is removed. Thus, the synthetic rubber main body is manufactured.

Further, continuous with Step S11, an embossing process is performed (Step S12). In this step, a surface that will become the lower surface <NUM> of the synthetic rubber portion <NUM> in the synthetic rubber main body is embossed. Here, for example, the embossing process is performed by processing, such as removal of a region excluding a part becoming the plurality of grid-like projecting portions <NUM> in the surface <NUM>. Through the above-described Step S <NUM> and Step S12, the synthetic rubber portion <NUM> is manufactured and prepared.

Note that the above-described Step S11 and Step S12 may be performed simultaneously with the steps of Step S01 and Step S02 concurrently, or may be performed in a period before and after the steps of Step S01 and Step S02.

Subsequently, the synthetic rubber portion <NUM> is fitted to the foam rubber portion <NUM> (Step S03).

In this step, as illustrated in <FIG>,the synthetic rubber portion <NUM> is fitted to the depressed portion 11b of the foam rubber portion <NUM>. Then, the synthetic rubber portion <NUM> is joined to the foam rubber portion <NUM>. In this respect, an adhesive may be disposed between the depressed portion 11b and the synthetic rubber portion <NUM> so as to be mutually bonded via the adhesive.

The footwear <NUM> is completed by the above-described steps.

The above-described manufacturing method uses the method for manufacturing the footwear <NUM> that wraps the entire foot and is allowed to be placed upside down to avoid the inside of the footwear <NUM> to get dirty with rain and dust. The method includes: a step of manufacturing the main body <NUM> having the shape in which the opening <NUM> of the footwear <NUM> becomes flat with the foam rubber having the specific gravity of <NUM>/cm<NUM>; subsequently, a step of digging the part from the center T between the toe and the heel to a heel portion <NUM> as the part of the bottom <NUM> of the main body <NUM> manufactured with the foam rubber; and subsequently, a step of fitting the synthetic rubber having the specific gravity of <NUM>/cm<NUM> in the dug depressed portion (the groove)11b. The center of gravity of the footwear <NUM> is set in the heel side using the difference in the specific gravity. The manufacturing method allows easily manufacturing the footwear <NUM>.

Note that the footwear <NUM> is not limited to be manufactured by the above-described method, but may be manufactured by, for example, the following method. That is, in the above-described method for manufacturing the footwear <NUM>, the main body <NUM> is manufactured (Step S01), and then the depressed portion 11b is formed on the main body <NUM> (Step S02) to manufacture the foam rubber portion <NUM>. Instead of these steps, a mold having a shape of the foam rubber portion <NUM> having a shape corresponding to the depressed portion 11b may be prepared, and the foam rubber portion <NUM> may be manufactured by injection molding using the mold. In the above-described method for manufacturing the footwear <NUM>, the synthetic rubber main body is manufactured (Step S11), and after that the embossing process is performed (Step S12). Instead of this, a mold having a shape of the synthetic rubber portion <NUM> having a shape after an embossing process may be prepared, and the synthetic rubber portion <NUM> may be manufactured by injection molding using the mold.

Subsequently, modifications of the above-described footwear <NUM> are described with reference to the drawings. In the following description, a component that is identical or similar to that of the embodiment is indicated by the identical reference numeral, and the description thereof is omitted or simplified. Note that methods for manufacturing footwears <NUM>, <NUM>, <NUM>, and <NUM> according to the modifications described below are similar to the method for manufacturing the footwear <NUM> described above.

With the footwear <NUM> according to the above-described embodiment, the width W3 in the right-left direction of the opening end surface <NUM> is configured to be larger than the width W5 in the right-left direction of the upper portion <NUM> and the toe portion <NUM>. However, the configuration is not limited to this, and the following configuration is also possible. <FIG> is a plan view illustrating the footwear <NUM> according to a first modification, and <FIG> is a plan view illustrating the footwear <NUM> according to a second modification. The footwear <NUM> or <NUM> illustrated in <FIG> has the configuration identical to the above-described footwear <NUM> except for the configuration of the width in the right-left direction. As illustrated in <FIG>, in the footwear <NUM>, the width W3 in the right-left direction of the opening end surface <NUM> is configured to be smaller (narrower) than a width W25 in the right-left direction of an upper portion <NUM> and a toe portion <NUM>. Further, as illustrated in <FIG>, in the footwear <NUM>, the width W3 in the right-left direction of the opening end surface <NUM> is configured to have a length identical to a width W35 in the right-left direction of an upper portion <NUM> and a toe portion <NUM>. Since the footwear <NUM> or <NUM> also has the opening end surface <NUM> as the above-described inclined surface, similarly to the footwear <NUM> according to the embodiment, the footwear <NUM> or <NUM> can be in the stable state even placed upside down.

With the above-described footwear <NUM> according to the embodiment, the lower surface <NUM> of the synthetic rubber portion <NUM> projects downward from the lower surface 11a of the foam rubber portion <NUM>, but the following configuration is also possible. <FIG> is a cross-sectional view illustrating the footwear <NUM> according to a third modification. The drawing is a cross-sectional view along the line equivalent to the line A-A in <FIG>. The footwear <NUM> illustrated in <FIG> has the configuration identical to the above-described footwear <NUM> except for the thickness of the synthetic rubber portion <NUM>, and a lower surface <NUM> of a synthetic rubber portion <NUM> is formed to be flush with the lower surface 11a of the foam rubber portion <NUM>.

Furthermore, in the footwear <NUM> according to the above-described embodiment, the width W1 in the right-left direction of the opening <NUM> is configured to be smaller (shorter) than the width W2 in the direction perpendicular to the direction of the width W1, and the width W3 in the right-left direction of the opening end surface <NUM> is configured to be smaller (narrower) than the width W4 in the direction perpendicular to the direction of the width W3, but the following configuration is also possible. <FIG> illustrates the footwear <NUM> according to a fourth modification, <FIG> illustrates a plan view, and <FIG> is a cross-sectional view along the line equivalent to the line A-A in <FIG>. The footwear <NUM> illustrated in <FIG> has the configuration identical to the above-described footwear <NUM> except for the configuration of the opening <NUM> and the opening end surface <NUM>. With the footwear <NUM>, a width W51 in a right-left direction of an opening <NUM> is configured to be larger (longer) than a width W52 in a direction perpendicular to the direction of the width W51, and a width W53 in the right-left direction of an opening end surface <NUM> is configured to be larger (wider) than a width W54 in a direction perpendicular to the direction of the width W53. Like the footwear <NUM>, the opening <NUM> of the footwear <NUM> according to the embodiment can be widened in the lateral direction (the right-left direction). The configuration of the footwear <NUM> allows stabilizing the footwear <NUM> against a side wind received by the side surface of the footwear <NUM>. That is, with the footwear <NUM> according to the fourth modification, the opening <NUM> and the opening end surface <NUM> of the footwear <NUM> according to the embodiment are widened in the lateral direction. This allows further reliably avoiding the footwear <NUM> placed upside down to fall over toward the side surface side (the left side or the right side).

Claim 1:
A footwear (<NUM>) for wrapping an entire foot, comprising
a main body (<NUM>) made of foam rubber and an embedded part (<NUM>) made of synthetic rubber, wherein
the main body is dug and configured to embed the embedded part made of synthetic rubber into a heel side (<NUM>) of a bottom of the main body made of the foam rubber,
the embedded part is a part from a mid-point from a toe to a heel to a heel part of the bottom of the main body,
specific gravities of the foam rubber and the synthetic rubber are <NUM>/cm<NUM> and <NUM>/cm<NUM>, respectively,
a center of gravity of the footwear is shifted to the heel side using a difference in the specific gravity of both to increase stability such that the footwear does not fall over when the footwear is placed upside down, and
an opening (<NUM>) of the footwear is further formed to be flat with respect to a ground surface when the footwear is placed upside down.