Ppemium-Quality Materials. These battery powered socks are made of 90% cotton and 10% spandex to be warm and breathable. Spandex is a stretchy material that will hug your feet and legs snugly and prevent slipping down. It will also allow you to put these socks on any feet size. Cotton will let your feet breathe while keeping them warm. Because of excellent absorption features, your feet will be always dry.
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