Chill-Its 6235 L/XL Khaki Standard Phase Change Cooling Vest - Vest OnlyErgodyne Ei 12004 The Chill Its 6230 Standard Phase Change Cooling Vest is made to house phase change cooling packs to keep workers cooler, safer and more productive. The phase change cooling material maintains a 64 F (18 C) temperature for up to 4 hours when activated. Made of a comfortable cotton blend fabric, this vest features adjustable hook and loop closures at the shoulders and waist to provide a customized comfortable fit. SIZING The cooling