Heat Holders Lite thermal socks have been designed to provide our famous thermal protection and comfort in a medium thick profile, ideal for wearing in casual shoes and boots and have a medium loop length with 1.60 tog rating. Keep feet warm on the coldest of days, medium thickness, Crew length Heat Holders Lite for men, the warmest thermal sock. Heat Holders are made from a specially developed heavy bulk yarn which has extreme thermal qualities. With medium pile cushioning, these thermal socks will help keep feet fully comfortable and supported. The inside of each sock has been intensively brushed that not only feels sensationally soft but also traps warm air close to the skin keeping your feet warmer for longer. Heat Holders are non-binding. They are Diabetic friendly and provide Relief for cold feet due to circulation problems. Fiber composition: 93% acrylic, 6% polyester, 1% elastane.