Professionals Choice Equine Sports Medicine Ventech Elite Leg Boot Value Pack, Set of 4 Neoprene & UltraShock Lining breathes and conforms better to your horse Limestone-Based Neoprene won't crack or crumble and returns to its original shape even after thousands of uses UltraShock Lining absorbs negative energy Suspensory Strap stretches upon each stride while allowing a natural range of motion and helps eliminate hyperextension of the fetlock Cut-Away Front cut slightly higher at the bottom to allow a more comfortable fit when using Ballistic Overreach Boots or Quick-Wrap Bell Boots