A sockliner for a shoe, the sockliner being manufactured in a relaxed conformation and taking on an in-use conformation when placed inside the shoe, wherein the sockliner comprises: a first surface having a first perimeter and a first configuration which is flat; a second, contoured surface opposing the first surface and having a second perimeter smaller than the first perimeter, wherein the second, contoured surface comprises at least one arc, wherein the at least one arc is concave relative to the first surface when the sockliner is in the relaxed conformation; a third surface joining an edge of the first surface to a corresponding edge of the second, contoured surface; and a fourth surface joining a second edge of the first surface to a corresponding second edge of the second, contoured surface; the third and fourth surface (159, 163) each comprising one or more contours between the first and second perimeters, making the sockliner thinner in the area between the first and second perimeters than within the second perimeter, wherein on lifting the third and fourth surfaces (159, 163) away from the second surface, the first surface assumes a second configuration which is not a flat surface, wherein the sockliner in the second configuration of the first surface conforms to the interior of the shoe, wherein the sockliner is characterized by: wherein, in the relaxed conformation of the sockliner, the third surface is concave relative to a center of the sockliner; and wherein, in the relaxed conformation of the sockliner, the fourth surface is concave relative to the center of the sockliner. a first surface having a first perimeter and a first configuration which is flat; a second, contoured surface opposing the first surface and having a second perimeter smaller than the first perimeter, wherein the second, contoured surface comprises at least one arc, wherein the at least one arc is concave relative to the first surface when the sockliner is in the relaxed conformation; a third surface joining an edge of the first surface to a corresponding edge of the second, contoured surface; and a fourth surface joining a second edge of the first surface to a corresponding second edge of the second, contoured surface; the third and fourth surface (159, 163) each comprising one or more contours between the first and second perimeters, making the sockliner thinner in the area between the first and second perimeters than within the second perimeter, wherein on lifting the third and fourth surfaces (159, 163) away from the second surface, the first surface assumes a second configuration which is not a flat surface, wherein the sockliner in the second configuration of the first surface conforms to the interior of the shoe, wherein the sockliner is characterized by: wherein, in the relaxed conformation of the sockliner, the third surface is concave relative to a center of the sockliner; and wherein, in the relaxed conformation of the sockliner, the fourth surface is concave relative to the center of the sockliner. wherein, in the relaxed conformation of the sockliner, the third surface is concave relative to a center of the sockliner; and wherein, in the relaxed conformation of the sockliner, the fourth surface is concave relative to the center of the sockliner.