Hand warmers made of cotton silk that are gentle on the skin. The seamless WHOLEGARMENT (R) fabric is woven to feel comfortable against the skin without feeling constricting. Perfect for preventing drafts from the cuffs of your coat. The open fingertips make it easy to operate your smartphone, so you can use it comfortably at home. The best part is that you can wash it at home even if you sweat. It is also attractive that it can be used for many seasons due to the gentle warmth of cotton silk.