The Chill-Its Phase Change Cooling Vest maintains a constant temperature of 58°F for up to four hours, which helps keep workers cool and safe from heat stress. It is made from 9.6 oz. cotton treated with flame-resistant Banox FR3®, which passes ASTM F1506 and provides an ATPV of 9.4 cal/cm² (Hazard Risk Category 2). Banox FR3® is a lower cost alternative in applications where garments are not likely to last beyond 50 home washes.