These are leg warmers from BS Fine. I was considering using them because I get cold easily, but the size didn't fit, so I'm selling them. I only tried them on. The instruction paper got wrinkled during storage, but I will include it as well. They use a new functional material that incorporates natural black silica, used in bedrock bathing, into polyester fibers using cutting-edge technology. It is said that just by wearing them, your body will gently warm up, like in a bedrock bath.