Heat Holders Mens Superman Slipper Socks These great Licensed Character slipper socks have been designed to keep feet warm on the coldest of days. Thick, chunky and with a massive tog rating of 2.34, Heat Holders® are made from a specially developed heavy bulk yarn which has extreme thermal qualities. With long pile cushioning, these thermal slipper 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 These socks are machine washable at 40. They are made from 91% Acrylic, 5% Nylon, 3% Polyester, 1% Elastane. Extra Product Details High Tog Rating - Brushed Inner - Thermal Qualities - Long Pile Cushioning - Crew Socks