Feature:1. Principle: Cooling air vest can produce cooling air by adjusting the temperature difference of 30 between the upper and lower air conditioners.2. Keep Cooling: Air compressed cooling vest can deliver cooling air to all parts of the vest through the hose, make users feel cool and comfortable.3. Manual Adjust: With manual knob to adjust air outlet temperature thermometer, plug and play, which is convenient for you to operation and use.4. Constant Temperature: If the compressed air intake pressure and temperature are kept constant, the outlet temperature will be maintained at 1F(0.6C) continuously.5. Widely Use: Air conditioner waistcoat suitable for cold labor protection environment, such as metallurgy, forging, welding, boiler plant, sandblasting, paint and so on.Specification:Item Type: Air Compressed Cooling VestMaterial: Aluminum Alloy, Nylon, Oxford ClothSize: Adjust (Hoop and loop fasteners)Composition: Nylon cooler and vestCold Source: Compressed air (compressor only, no accessories required)Weight: Approx. 1045g / 36.87oz.Package List:1 x Vest1 x Air Compressed Cooling Machine1 x Belt