Patent ID: 7673398

Claim:
A shoe for sports comprising: a) a shoe upper portion that is adapted to cover a user's foot; b) a ground friction device that is adapted to increase friction on a ground; and c) an outer sole that is adapted to surround the user's foot together with the shoe upper portion, wherein the outer sole comprises one or more through holes, a top surface that is adapted to support the user's foot and a bottom surface that is opposite to the top surface, wherein the ground friction device is assembled to the outer sole by being inserted into the through holes; wherein the through hole comprises a hole threaded portion, a lower end that is adjacent to the bottom surface of the outer sole and an upper end that is adjacent to the top surface of the outer sole, wherein the ground friction device comprises one or more friction elements, each of the friction elements comprises a cylindrical body and one or more protrusions that protrude from the body, and wherein the cylindrical body comprises a body threaded portion, which engages with the hole threaded portion; wherein the through hole further comprises a first annular recess, wherein the friction element further comprises a first sealing ring, wherein the first sealing ring is received in the first annular recess; and wherein the through hole further comprises a second annular recess, wherein the friction element further comprises a second sealing ring, wherein the second sealing ring is received in the second annular recess, wherein the first annular recess is provided near the lower end of the through hole, wherein the second annular recess is provided near the upper end of the through hole.