Thermal Socks keep your feet warm and toasty, thanks to their extra layer of comfort. The soft brushed inner lining retains heat and warmth, making thermal socks ideal for winter. You will find that thermal socks are made from softer materials, such as wool. This is so the socks can absorb moisture and sweat away, to keep your feet warmer for longer. Thermal socks contain insulated materials to further retain warmth.