Body is made of three breathable layers. Outer layer is nylon for durability. Middle layer is perforated neoprene for support. Inner layer is a soft jersey for comfort. Rugged molded shells are stratigically placed for protection of the inner splint area, the tendon area, and the fetlock area. Constructed with darts for a close clean fit and bound with lycra to keep the dirt and debris out. Fastened with a simple but secure, easy on, easy off system of hook-and-loop straps. Classic Equine Pro Tech Splint Hind Horse BootsUnique Form Fitting Outer ShellTough Molded ShellsBreathable LayersNylon OuterDouble Hook and Loop ClosuresContoured DesignSecure FitPT201Breathable exterior with an ergonomic fit great for showing or training. The splint pad and tendon guards are strategically placed for protection of the inner splint, fetlock and surrounding soft tissue with a soft jersey lining with bound edges that keeps the dirt out. The simple and safe closure is easy for safe on/off application.