These polyurethane tendon boots have a durable, shock-absorbing lining made of 5mm neoprene. The boot is reinforced with a 600D nylon lining at the point where the Velcro closures are attached. All Pro Max tendon boots are equipped with an integrated inner layer made of preformed synthetic material. The Pro Max Pro provides even more complete protection, thanks to its exterior impact zone made of PVC. Matching Pro Max BR High Boots, item 312031. Size S: 2 Velcro closures – Front pony legs Size M: 3 Velcro closures – Rear pony legs/ Full front legs Size L: 4 Velcro closures – Full rear legs