The BMW Cooling Vest Cool Down is made of technical nylon and polyester fibers, it is intended to be worn under your motorcycle suit during hot temperatures and summer. To keep you cool, the vest uses a special technology: soaked in water, it stores moisture and keeps it for up to 8 hours thanks to the HyperKewl material. Once worn, the moisture evaporates, cooling you 6 to 12 ° C compared to the outside temperature. Although storing moisture, the vest remains completely dry. On each side we have light and elastic mesh inserts to facilitate your movements. BMW Cooling Vest Cool Down | BMW Motorrad