PROBLEM TO BE SOLVED: To reinforce a truss function, to stabilize an ankle bone lower joint, and to improve stability in standing posture and exercise motions.SOLUTION: The sock includes: a low-stretch area 10 formed in an inner side area from an outer side calcaneus to a proximal phalanx of a thumb and arranged peripherally around the proximal phalanx of the thumb in the proximal phalanx of the thumb a low-stretch area 12 formed to pass from an outer side calcaneus side edge of the area 10 through an instep part to the area 10 a low-stretch area 11 formed on a sole face in a triangle with apexes of a thenar, a hypothenar, and a calcaneus ground contact part and having a general trapezoidal shape with sides of a straight line from a front of the thenar to a front of the calcaneus ground contact part, a straight line from a cuboid distal edge to a cuboid proximal edge, a straight line from the front of the thenar to the cuboid distal edge, and a straight line from the front of the calcaneus ground contact part to the cuboid proximal edge and a low-stretch area 14 formed to be arranged around the instep part.SELECTED DRAWING: Figure 1
