Lined with specially developed Air Liner, a highly breathable lining with perfect shock absorption. Improved streamlined fit based on the Form Follows Function principle, allowing the boot to seamlessly fit to the horse leg for unimpeded movement and protection. Ventilating shell produced using a self developed mould 10 percent lighter than the average tendon boot. Innovative design based on research. Horse tendons are extremely vulnerable and prone to injury. Many tendon boots cause heat buildup or are too tight fitted. BR understands the importance of a protective but comfortable fit. Discover the self developed XO2 Boot. An innovative design based on extensive research into the anatomy of the horse leg and made with a unique mould developed by BR. The result is a must have tendon boot that optimally protects absorbs shocks and keeps the horses leg as cool as possible.