The Chill-Its Lightweight Phase Change Cooling Vest Packs are made to be inserted into model 6255 Lightweight Phase Change Cooling Vest to keep workers cooler, safer and more productive. The phase change cooling material in the packs is 100% biodegradable and maintain a 59° F (15° C) temperature for up to 2 hours when activated. These packs are designed to be 30%-60% lighter weight than other cooling vests on the market. Features: Instant & lasting cooling relief: Packs maintain constant 59°F (15°C) for up to 2 hours Quick recharge: Packs recharge in alittle as 5 minutes 100% biodegradable phase change cooling material Flexible: Grid ice pack design eliminates stiffness Lightweight: 30%-60% lighter weight than other cooling vests Vest sold separately and feature: Perfect fit: Adjustable hook and loop closures on waist Easy on/off: Heavy-Duty zipper closure on the front of vest Two front pockets with zipper closures for extra storage Comfortable polyester cotton blend construction Application: Pulp/Paper Iron/Steel Fabrication Hazmat Fire/Rescue/EMT Vulcanizing Construction Utilities Refineries Foundries HOW TO USE *** Phase Change Vest not included. *** Purchase the lightweight vest with packs kit here or purchase the Lightweight Vest separately. There are many ways to activate your cooling vest. Simply place the two removable packs in a cooler of ice water for 5 minutes; freezer for 8 minutes; refrigerator for 12 minutes; or near an air conditioner for 1 hour. Then place the recharged cooling packs in the vest pockets for hours of cooling. HOW TO CLEAN The cooling pack should be washed by hand with a mild detergent and warm water. Dry with a paper towel or cloth. DO NOT machine wash or machine dry. This body cooling vest is perfect for anyone in need of instant cooling relief while working or playing outside or indoors in warm temperatures where heat-related illnesses like heat cramps, heat strokes, heat exhaustion, etc. are possible. Ideal for workers in pulp/paper, iron/steel, vulcanizing, foundries, etc. or for people running, biking, doing yard work, riding motorcycle and more! Also, ideal for those needing cooling relief but aren't able to use an evaporative cooling option. Ergodyne Chill-Its 6250 Phase Change Cooling Vest Packs - Set of 4