HorseSaddleShop Professionals Choice VanTECH Elite Sports Medicine Boot See image for sizing. Eclusive limestone-based neoprene. 360 degrees of impact protection Prevents hyperextension of the fetloock. Provides support and balance for the horse's entire suspensory system. Contoured fit is cut back for easy use with overreach boots. State of the art technology, absorbs and idssipates over 26% of negative energy from hoof concusion. Trademarked Ventech technology - ventilated neoprene conforms to your horse, allows heat and moisture to escape, keeping your horse cool, comfortable and performing at its best.