The new fetlock boots for young horses are made of durable TPU material, with a robust shield and numerous ventilation holes, including a larger triangular mesh ventilation. For extra durability during movement of the hind legs, the inner part of the fetlock boots is reinforced with an extra layer of TPU. These fetlock boots for young horses are approved for use during jumping lessons for young horses according to the FEI rules. Please note: Size M fits like a full.