Heat Holders Mens Batman 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. These socks are made from 91% Acrylic, 5% Nylon, 3% Polyester, 1% Elastane. They are machine washable at 40. Extra Product Details -Offical Licensed Socks - Thermal Lining - Soft and Warm - Non-Slip Grips - High Tog Rating