The protectors have a hard outer shell made of polyurethane that is cut slightly deeper on the top of the back of the tendon boot for a perfect fit and more freedom of movement. As a result, the protectors will not rotate while striking. Both the tendon boot and the fetlock boot are lined with neoprene and close with folded back hook and loop fasteners. Perfect fit and plenty of freedom of movement due to the cut-out at the back of the tendon boot. The fetlock boot fits snugly around the fetlock.