These boots are super light, flexible, ventilating, have a non-slip inner lining and are made of "PVC-leather" outer material. They have a very nice fit, strong velcro closures and are very comfortable for the horse.The optimal fit gives the horse a lot of freedom of movement. The protector has a flexible polycarbonate plate on the tendon for extra protection that is desired during Eventing.This protector is specially designed for the hind legs (for the front legs see article number 33200024).