These inserts provide greater shock absorption; sole, bar and frog stimulation; extra cushioning; increased circulation; and helps minimize fatigue and tighten fit. Made from specially formulated gel that helps your horse's hooves feel good. For temporary use with Cavallo Boots. One size fits all - simply choose the side of the gel pad which shows the style of boot you're using, cut the pad to fit your boot size using the engraved size chart and insert.