FRONTS. New improved, form fitting Extreme Vented Sport Boots. Features: Darts placed in key locations that allow the Tough-1 boot to conform to the leg providing support while keeping dirt and debris out. The vented inner layer works in conjunction with the vented outer layer to provide 360º of maximum protection and comfort. Suspensory Sling provides flexible support to the fetlock while not restricting movement or inhibiting performance.