BMW Genuine Motorcycle Motorrad Cool Down vest - Color: Black - Size: EU XL US XL BMW Genuine Motorcycle Motorrad Cool Down vest - Color: Black - Size: EU XL US XL This revolutionary functional vest uses evaporation to keep riders coo l. When water is applied to the jacket, the HyperKewl system lock s in the moisture and stores it for up to eight hour s, reducing heat by around 11 to 22F compared to the ambient temperature. At the same time, clothing stays perfectly dry. The effect can be repeated as many times as necessary and the ultra-lightweight garment fits comfortably beneath all BMW Motorrad summer weight textile jackets. A cooling vest with HyperKewl functional fabric at the back and the front - Constant cooling effect created through evaporation - Outer material: nylon and polyester functional fiber - Stretchy side sections - Front zip