Canyon Men's Cooling VestMeet the Canyon Cooling Vest Cool. Comfortable. Built for Summer. When the heat hits, Canyon keeps you moving. This sleek, zip up vest uses a quiet circulation system and included 10,000 mAh power bank to send ice chilled water through internal channels, cooling your core without getting in your way. How It Works Just fill the built in reservoir with clean water, add the included ice pack, and press start. Canyon does the restquietly and effectively.