This is a water-cooling vest purchased in the summer of 2022. It has been stored at home unused since purchase. The battery is also being sold as a set. You can stay cool until the battery runs out by replacing the ice. The size can be adjusted from XL to 3L with the size adjustment belts on the sides. This is an item that will be especially useful in the coming season. Although it is new and unused, please refrain from purchasing if you are sensitive to items stored at home.