Booster Cooling Pack Set - for use with Sports, Classic, Concealable, and High-Visibility Cool Vest

PREPARE TO BE COOL: Booster packs work with standard set to extend cooling by 45 minutes. Booster packs fit Glacier Tek sports, concealable, original and classic cooling vests. Recharges in freezer. Booster packs weigh 7 ounces each and measure 9.25" by 5.25" by 0.5." Made from 100% phase change materials. Can be sanitized and reused indefinitely.