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Attaches to your backpack to relieve the discomfort caused by sweat between your childs back and the school bag. It also prevents sweat from getting stuffy in your back while climbing or going to school on hot days, so it can also prevent sweat stains on your backpack. The outer fabric absorbs sweat quickly. The lining is made of a honeycomb mesh with a three-dimensional honeycomb structure that is similar to a honeycomb to ensure air passage, and it is cushioned and soft to wear. Furthermore, the included refrigerant pad is liquidated from crystals (crushing) at a temperature slightly lower than body temperature to maintain a cooling sensation. In addition, the liquid ice packs are higher than room temperature, so the heat absorbed into the air is released and returned to the solid for a longer lasting coolness. The crystals are solidized again even after melting, so you can repeatedly absorb the heat over and over again. Simply attach the elastic strap with a buckle to the top of the school bag, and the elastic strap with hook and eye on the bottom hardware of the backpack can be snapped on the left and right. It can also be reversible, by turning the mounting upside down and using mesh fabric on the back.