Product description 3 Pairs of Men's Heated Sox - Thermal Socks for Winter Tog rating of 2.13 tested to BS4745 standard. Considerably higher than normal thermal or cotton socks. A high Tog rating provides extra insulation against low temperatures. High bulk acrylic yarn - reinforced heel and toe for extra durability Brushed inside - comfort toe seam to reduce abrasion and improve comfort Moisture control to keep feet dry 91% acrylic, 5% nylon, 3% polyester, 1% elastaine Wash dark colors separately. Please remove barb with scissors. When placing on foot roll back to ensure loops do not catch on toes.