Boot Sizing: Measure around leg halfway between the knee and fetlock Small = under 7" Medium = 7" to 8" Large = 8" to 9" Extra Large = 9" to 10" The PRO H35 Junior Splint Wrap is the perfect low profile protection for the splint bone and cannon bone when no previous injuries have occurred. Easy to apply, the matched hook and loop fasteners make for a very durable protective wrap. The body is constructed of orthopedic grade neoprene with a shock absorbing pad sewn between the body and the outer sheath. Machine washable. Sized small, medium, large and extra large in a variety of colors. Refer to size and color charts.