The Kenetrek Glacier Sock is a quick drying and durable sock made with merino wool, naturally cooling and heating your feet when needed. The arch support increases circulation and decreases foot fatigue, while the reinforced heel and toes reduces slippage. They are designed to avoid any abrasions, such as blisters, and are odor free. Kenetrek’s Glacier Sock the best all-round sock taking you anywhere , any season. Heavy weight, boot height. Made in USA. 65% Merino Wool, 24% Nylon, 8% Elastic, 3% Lycra.