Equilibrium Tri-Zone® Airlite Impact Sport Boots Hind in Black. The Equilibrium Tri-Zone® Airlite Impact Sport Boot is a highly protective boot designed to protect the horse's legs across a wide range of high impact sports like cross country, hunting, driving and polo. The Impact Sport Boots are made of three protective layers; the inner layer is made from soft impact absorbing EVA that is formed into pillows for maximum comfort and is perforated to allow heat to evaporate, the middle layer is made from EVA mesh which absorbs impact yet allows heat to escape freely and the outer strike pad is made from TPU and protects from penetration injuries. Read more… The Boots also feature strategically placed panels of TPU within the boot to protect the vulnerable areas of the horse's leg. The Impact Sport Boots are breathable, extremely lightweight and absorb very little water preventing them from getting heavy when wet. The Boots are fully flexible both horizontally and vertically and so allow for full joint movement without restriction. The Impact Boots feature a double locking velcro fastening for added security with a handy grip tab allowing the boots to be removed easily whatever the conditions. Available in Horse Size only.