• Advanced Technology Phase Change Material (PCM) Technology• Comfortable 65°F temperature even in the most extreme heated environments• Designed to absorb body heat generated by the wearer while remaining comfortable to wearFeatures• Vest has a zipper front, velcro shoulder straps, and buckle side straps for maximum adjustabilityVest Sizing• Cool Vests are available in two sizes: Standard and XL.Easy to Recharge• Cool packs can be recharged both in ice water and in freezer very quickly (15-20 minutes) or even in a refrigerator which can take around an hour depending on how cold it is setSpare Cool Packs• One spare cool pack set is recommended for every vest purchased so the workers will have a recharged set toimmediately put in the vest once the one they are wearing needs recharging