Cotton socks are very comfortable, but they get damp quickly and can start sliding around in your shoes as you walk. Even with perfectly fitted shoes, a little bit of movement can cause friction against the skin, leading to a blister or a hot spot. If you don’t have an allergy or aversion to synthetic materials, purchase socks that have a blend of materials that wick away sweat and that incorporate Spandex so the socks stay in place on your feet.