Old Mac's Hoof Boot Inserts LARGE. English/Western/Trail/Mules/Packing-. Useful to anyone with long narrow hooves. Very similar in design to the cavallo boots used today in that they also need inserts to make them perfect. Old Macs and easy care boots are great but the inserts definitely help make them just right. These are new in the box-box is a little dusty. Ready to ship.