Our Tough1 Extreme Vented Sport Boots provide 360 degrees of maximum protection. These boots feature a suspensory sling strap that provides flexible fetlock and tendon support without restricting movement or inhibiting performance. The vented (perforated) inner and outer layers allow heat to escape while keeping dirt and debris out. They're made complete with super tough "Quick Grip" closures for a secure fit every ride. Set of 4. Front (Small: 10" tall x 9 1/2" wide. Medium: 11" tall x 10 1/2" wide. Large: 12" tall x 11 1/2" wide.) Rear (Small: 11" tall x 10 1/2" wide. Medium: 12" tall x 11 1/2" wide. Large: 13" tall x 12 1/2" wide.)