Cotton is a natural product that is lightweight, soft, durable and breathable combining nylon and elastane for added resiliance. Refer to manufacturer's care instructions for a machine washable option. Wash socks inside-out to keep a pristine outer appearance on a low temperature. Add a little fabric softener to recondition the yarns, add softness and a little more stretch. Do not tumble dry. When hand-washing use a low temperature and rinse in clear water.