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Look after your legs with the Self-Heating Thermostatic Knee High Socks The outer layer of the sock is made from cotton making them soft and comfortable to wear The socks are breathable, keeping your feet from getting too warm or sweaty These socks will help keep your feet warm in cold weather and help relieve muscle tension and soreness One size fits most Made of cotton and polypropylene Available to purchase as either a single pair or 3 pairs Buying Options: 4.99 pounds instead of 12.99 pounds for 1 Pair of Socks - Save 62% 12.99 pounds instead of 34.99 pounds for 3 Pairs of Socks - Save 63%