Back on Track 18.5-Inch Top 16-Inch Bottom Therapeutic Horse Hock Brace with Hole, X-Large Back on Track Hock Braces are Made From Fabric Infused With Ceramic; The Ceramic Reflects Natural Body Heat and Creates Soothing Infrared Warmth State-of-The-Art Therapy is Clinically Proven to Reduce Pain And Chronic Inflammation The Hock Braces are made from Durable Neoprene and Offer Superior Protection as They Maintain Close Contact with The Tendons and Bones in The Leg Back on Track Hock Braces Are Ideal For Injury Recovery or Prevention in The Tough To Wrap Knee Areas Contours To The Shape of Your Horses Hock, The Boot Fastens With Velcro Straps Allowing You To Easily Adjust The Fit