These are the best bell boots available on the market! My horse needs to wear them 24/7 due to corrective and specialist shoeing. They last her an entire year of use before the rubber will start to go. They are the only bell boots that are long enough to cover the heel bulbs and protect the whole hoof and shoe. Cheaper brands do not cover the length of the hoof and leave heels and shoes exposed for injury or to be pulled off. My horse wears a size 2 shoe and the XL fits her perfectly.