Kensington Fly Boots with Fleece Trim feature 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 Hook and Loop straps for a secure fit. The woven mesh fabric is 78% air permeable and is non-heat transferring making it the perfect choice for summer time cooling and it blocks up to 73% of harmful UV rays. Size: Large (Average, 900-1200 lb). Boot Height = 15", Circumference = 10.5" - 12.5" Sold in pairs of 2.