A long time favorite, the H20 Sports Support is now available in a rear boot! The H20 Sports Support & H20R Rear Sports Suport are both low profile boots that provide protection with support. The H20R Rear Support is constructed of orthopedic grade neoprene in the same patented PRO design as the original H20 only 2" taller offering additional support for tendons and ligaments. The equal length fetlock support strap allows the user to adjust the angle and amount of support to fit the horse. Machine washable and available in a variety of colors. Boot Sizing: Measure around leg halfway between the knee and fetlock: Under 7" = Small 7" to 8" = Medium 8" to 9" = Large 9" to 10"= XLarge