Professional Equine Medium 4-Pack Sports Medicine Splint Boots Purple 41PRC Medium Purple Professional Equine neoprene sports medicine boots help safeguard the cannon bone, tendons and soft tissue, while absorbing energy from hoof impact. The slightly longer suspensory strap stretches with each stride allowing full ankle movement, and helps to eliminate hyperextension of the fetlock. Nylon Velcro straps stretch to create a more snug fit along the top and bottom of the boot, helping to keep dirt out.