390 PCVKT1 Phase Change Cooling System with Cooling Packs Safety Helmet thereby protecting the wearer against Size:40" thereby protecting the wearer against heat stress Two lower pockets with zipper closures 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