This is a gel pack that can be used repeatedly by heating it in the microwave or hot water, or by cooling it in the refrigerator or freezer. The soft cover provides a comfortable experience, allowing the warmth or coolness to be transmitted moderately. The soft gel doesn't become hard even when frozen, so it fits perfectly where you want to cool it. (From the package description) ■ A gel pack is inside a towel-like cover. ■ Unused item. I took it out of the outer box for confirmation, but the inner bag is unopened. ■ It has been stored indoors, but the outer box has discoloration, dents, and tears. ■ Set of 2. ■ Size: Approximately 24cm x 12cm x 1.5cm Shipping will be via Yamato Transport, Sagawa Express, or Japan Post. Thank you.