so the long pile has more surface area to hold more heat in for longer

but also hold warm air close to the skin keeping your feet warmer for longer

Ankle height stays invisible in shoes while still delivering serious thermal protection

with turn-up detailing

Women's Ellen Xmas ULTRA LITE® Penguin Crew Socks Transverse so the long pile hasAdvanced thermal yarn 3X warmer than the average cotton sock Sensationally soft Non binding comfort fit Cruelty free Heat Holders ULTRA LITE socks are 3X warmer than the average cotton sock, super soft, and comfortable. Keep your feet warm on chilly days with Heat Holders, makers of The Warmest Thermal Sock. No More Cold Feet! With a tog rating of 1. 0, Heat Holders ULTRA LITE socks are made with advanced thermal yarns which are extremely soft and