Chill-Its 6230 Standard Phase Change Cooling Vest with Packs, Cotton, Large/X-Large, KhakiThe Chill Its 6230 Standard Phase Change Cooling Vest helps keep workers cooler, safer and more productive. The phase change cooling material maintains a 64F (18C) temperature for up to four hours when activated. The vest is made of a comfortable cotton blend fabric with adjustable hook and loop closures at the shoulders and waist to provide a customized comfortable fit. There are many ways to activate your cooling vest. Simply place the two removable