The Woof Wear Kevlar bell boots are made from 8mm close cell neoprene. Kevlar is a man-made fiber that is stronger than steel. It combines strength and lightness. In this instance, it is bonded to neoprene which creates an extremely tough abrasion resistant finish giving the most protection to the horse. These bell boots are extra deep for maximum coverage of the heel area. The wide double lock Velcro strap is reinforced and features a pull tab for easy removal.