The surface is smooth and firm, and it can be put in the refrigerator in midsummer for extra cooling. I am selling it because it didn't fit my child's height. It has been opened, but it is new and unused. [Hiepuru Cooling Gel Sheet] It uses over 20,000 gel beads. The high water content of the gel beads absorbs the body's heat into the cooling sheet. Through the gel beads, the heat is highly conductive and diffusive, allowing the heat inside the carrier to dissipate into the air, providing coolness and a cooling effect. - Purchased for 3000 yen. - Please read the profile before purchasing. - Please refrain from purchasing if you are nervous or seeking perfection.