New Gear for Extreme Heat! A Cool Vest that Circulates Cold Water. This NEW gear creates a comfortable cooling sensation as cold water from the tank circulates through hoses running inside the vest. The vest material uses CORDURA®, known for its durability, making it suitable for tough work environments. The system runs on battery power, circulating the water. It can be used for approximately 7 hours at full power while replenishing with frozen water bottles or ice. When using frozen water bottles as the cooling material, you can also hydrate when they melt, providing an extra measure against the extreme heat. Material: Outer Fabric: 100% Nylon Lining: 100% Polyester Side Fabric: 80% Nylon, 20% Polyurethane Tank: TPU / Hose: Silicone Rubber Cooling Section: Aluminum Vapor Deposition, Foamed Polyethylene, Polyethylene, PET Color: Black Size: F (Fits M-3L)