The Tendon Boots Elastic have a tough outer shell casing which is styled in an extremely light yet strong TPU to protect against impact, whilst the tendon and fetlock areas are both reinforced with D3O shock absorbing molecules for ultimate protection. Laboratory tests have shown that the boots absorb impact over 50% better than any other boot currently on the market, with the ability to disperse a heavy blow equivalent to that which would actually break a human bone.