It's still hot, so let's get through it with this! Bigborn AQUATEC Aqua Water Vest AT101 Cools the body using only the power of water, no battery required. Employs a uniquely developed evaporative cooling system. An aqua water vest that's also perfect as an inner layer for fan-equipped wear. 【Unique Evaporative Cooling System】 Utilizing the principle that moisture evaporates (vaporizes) and draws heat from its surroundings, this vest provides a long-lasting cooling sensation with just water. *The cooling effect is based on the principle of evaporative cooling, so it varies depending on the surrounding temperature, humidity, and wind strength. Size: S Last year, my aunt wanted this and bought it on Rakuten, but she never used it and just left it. She doesn't seem to need it, so I got it, but the size doesn't fit me. So, I'm hoping someone will take it. Retail price: 19,800 yen