Ergodyne Chill-Its 6200 Phase Change Cooling Vest, Large/X-Large, Khaki Maintains constant 58 to keep workers cooler, safer and more productive. Maintains constant 58F/ 14C regardless of the ambient air temperature Cooling lifecycle lasts up to four hours Banox FR3 Fabric passes ASTM F1506; ATPV of 9.4 cal/cm (HRC 2)