The Thermax Sock Liners from Seirus can either be layered underneath thicker socks for extra comfort and insulation or worn as their own as a thin performance sock. Seirus’s Thermax fabric offers excellent insulation in a super thin material. They also have excellent wicking properties to help keep your feet dry even when you’re working hard, or during a long day of skiing when your feet are stuck in ski boots all day long. No matter what footwear you’re wearing these soft, form fitting socks will maximize comfort and keep your feet feeling warm, dry, and fresh.