Use the natural power of buckwheat to soothe your sore, tired feet after a hard day. You can warm them in the microwave to help improve blood circulation and soothe aches and pains. Or chill them in the freezer for bruises and sprains. They fasten securely with a Velcro style closure. Available in pairs in both Men's and ladies sizes. Made of 70% polyester/30% buckwheat. Please note that heat therapy is not suitable for diabetics.