Only available for Bowling Shoes with Removable Traction Sole Technology. Designed for the "Power Player" who needs extra protection for thier push-off shoe during agressive play. Goodyear non-marking rubber sole provides T3 standard traction. Full rubber sidewall construction provides extra protection from sole separation caused by toe or side foot drag. Solid full thickness rubber perimeter design provides extra protection and durability for the sole bottom edges and the sides of midsole in forefootAdjustable upper strap attachment system works independently of the current bottom hook and loop closure. Medium fits mens 9-12, Large fits Mens 13-15.