The AlphaCool 7V Circulatory Cooling Vest with a built-in water circulation unit brings the highest quality cooling technology into a compact vest for better wearability and easy operation. It includes a 3L quick-release bladder, a mini pump, a rechargeable battery, and a liquid cooling channel embedded in a mesh liner. The mini pump circulates cold water that will continuously flow throughout the vest, keeping it cool and comfortable in hot conditions. It features a waterproof and breathable outer fabric, 3D material interlay, and a double lines stitching cooling channel layer for maximum comfort.