EZ-Cool® Phase Change Cooling System with Cooling Packs Colling packs made in USA. Vest made in China Constructed from a 3 layer fabric combining hydrophilic fibers into a fibrous batting and thermally conductive core Spot wash or hand wash only Cooling properties can be reactivated for the life of the product; May be used over and over again Very durable and will last multiple seasons with proper care and normal use Perfect for use in high heat/humid areas and under protective equipment Provides comfortable cooling up to 3 hours Temperature set to 65° Adjustable at shoulders and torso for snug high fit to deliver cooling to the core Activate by placing the packs in a refrigerator or freezer for 1 hour or in a cooler with ice water for approximately 20 minutes One size fits most: up to size 58" chest