The Tough1 Hoof Guard Boot helps to protect your horse's hoof while keeping medication and conditioner in place. The ultra-strong and flexible molded poly/rubber material has an extra thick safety sole for durable wear to resist scuffs, scrapes and tears. These are a great option for emergency shoe replacement to protect the tender frog and hoof wall. Sold each.0000: 3.25" inside width, 3.5" inside length, .125" thickness; 000: 3.625" inside width, 4" inside length, .1875" thickness; 00: 4" inside width, 4.5" inside length, .25" thickness; 0: 4.5" inside width, 4.5" inside length, .25" thickness, 1: 5" inside width, 5" inside length, .25" thickness; 2: 5" inside width, 5.5" inside length, .3125" thickness; 3: 5.5" inside width, 6" inside length, .3125" thickness