Leatt Coolit Evaporative Cooling Vest (Gray, XX-Large) Feel up to 15 Degree - 20 Degree Fahrenheit (8 Degree - 11 Degree Celsius) cooler Recharge your tee/vest by re-soaking during the day; lasts 1-6 hours depending on weather conditions Easy to wear zip-up design should be worn next to the skin, under all other gear Up to 300 percent more evaporative cooling fabric coverage than others Hyperkewl is made from a polymer embedded fabric