Heat Force Warmest Twist Contrast Heel & Toes Crew Sock: Keep feet warm on even the coldest of days with the warmest thermal sock. Heat Force thermal socks are thick & chunky and made from advanced thermal yarns that have extreme thermal qualities. With long pile cushioning, these thermal socks offer comfort and support all day long. The inside of each sock has been intensively brushed so they feel sensationally soft and the inner pile also traps warm air close to the skin keeping your feet warmer for longer. Heat Force socks are non-binding, diabetic friendly, and provide relief for cold feet due to circulation problems. Content: 92%Acrylic 6%Polyester 1%Rubber 1%Spandex