Heat Holders Alex Mountain LITE Crew Socks for Men provide famous thermal protection and comfort in a medium-thick profile, ideal for wearing in casual shoes and boots. They're more than 4 times warmer than basic cotton socks. Compared to ORIGINAL, maximum-loop-length thermal socks with a 2.34 Thermal Overall Grade (TOG) rating, Heat Holders LITE thermal socks have a medium loop length with 1.60 TOG rating. They're made from a specially developed heavy bulk yarn which has extreme thermal qualities. The inside of each sock has been intensively brushed not only to feel sensationally soft but also trap warm air and keep your feet warmer, longer. Heat Holders are non-binding and diabetic-friendly, and they provide welcome relief for cold feet due to circulation problems. Machine wash. Imported.Manufacturer style #: HH1M07987. 93% acrylic/6% polyester/1% elastane Extra-large size Advanced thermal yarn More than 4 times warmer than basic cotton socks Sensationally soft Non-binding Diabetic-friendly