Kensington recently suffered a terrible fire at their factory. Please know we will restock once they reopen, but have very limited qtys for now. The Kensington Fly Boots protect your horse from more than just pesky biting insects. Features Stay-Up technology, a unique plastic stay system under the trim keeps the boots upright and in place on the leg, even when a horse stomps his foot. Contoured with 3 Velcro straps for a secure fit.