It's a red, shoe-shaped hot water bottle. It's a soft hot water bottle made of the same material as a diver's wetsuit. Use the included funnel to fill it with hot water. Your feet will gradually warm up when you put them in. - Color: Red - Size: S (24cm) Product page: https://cloz.biz/collections/yutanpo-foot/products/cloz-yutanpo-ashi-short Thank you for viewing. I bought it, but I haven't had the opportunity to work from home since then, so it's almost unused. If someone else purchases it while comments are being made, I will prioritize that person. There are no noticeable stains, but please understand that this is a home-stored, used item.