DermaSaver Heel Protectors have been designed with adjustable Velcro closures to enable proper and long term precise positioning on the heel without turning or sliding or slipping off the foot. Five layers of MicroSpring textile cover the heel to reduce pressure and friction on the heel and malleolus. DermaSaver Heel Protectors are made in 4 sizes. Simply measure around the circumference of the widest part of the foot and heel as per the diagram.