Assertion: flipper | /r/HasProperty | fin
Facets:
Source sentences:
text: More specifically, I provide a flipper which includes a shoe having a heel portion; a fin, having a front portion and a heel--surrounding portion, in which a hole having an area larger than that of said heel portion of said shoe is provided; an upwardly protruding and symmetrically disposed protruding strips on two sides of said fin front portion; a hinge means, which connects the bottom portion of said shoe with said fin front portion of the fin and allows the shoe to rotate with respect to the fin to an extent that the heel portion of said shoe goes beyond the said hole; a strap; a strap orienting member, the lower end of which is fixed to the end of the heel surrounding portion of the fin, with the upper end of the strap orienting member extending upwardly and having a hole within it; two buckles, being able to engage with or detached from the two protruding stripes, when detached, the strap can be fastened against the portion between the lower end of the calf and the instep of the feet by means of adjustable fastening means.