The Scoot Anti Slip Shim is constructed of non-slip material that is inserted into the front of the boot between the hoof and the boot. Provides extra security when the hoof gets wet and slippery inside the boot. Great as a filler inside the boot providing a firmer fit when the hoof is in between sizes or the hoof has shrunk in size, e.g. in dry conditions. The shims are easy to remove when not in use. XS fits Scoot Boot sizes 000, 00, 0, S fits Scoot Boot sizes 1, 2, 3, M fits Scoot Boot sizes 4, 5, 6, L fits Scoot Boot sizes 7, 8, 9.