Designed to be 30%-60% lighter weight than other cooling vests on the market, the Chill-Its Lightweight Phase Change Cooling Vest keeps workers cooler, safer and more productive. Its phase change cooling packs maintain a 64° F / 18° C temperature for up to two hours when activated. Constructed with a polyester cotton-blend fabric, the vest’s adjustable slide-buckle closures around the waist provide a customized fit for different body types. The heavy-duty front zipper makes for easy on/