Professionals Choice Equine Secure Fit Hoof Overreach Bell Boot, Pair Medium Black/Multicolor Durable Ballistic nylon outer cover and binding makes these boots especially tough and able to take the daily abuse of riding in any discipline. UltraShock lining absorbs energy from overreaching and protects the vital areas of the hoof, cornet band and bulbs of the heel, while the soft no-turn knob keeps the boot from spinning.