The HERIKEN cool vest features a compact design for easy wear. Equipped with a water cooling system, it's perfect for combating the heat. - Brand: HERIKEN - Type: Cool Vest - Size: One Size - Accessories: Water Cooling System - Features: Compact design, easy to wear I've only tested it out. Purchased on Amazon for 7185 yen. I used it for a week after purchase, but I'm selling it because I changed jobs. The straps are cut to fit the body, but I don't recommend wearing it like a shirt, as they might get in the way. The cooling system is working fine without any problems.