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Material:1. Vest: Polyester mesh with front velcro closure and hose inside.2. cooler: plastic and metal with oil-water separator.3. Belt: 100% polyester with plastic flat side release buckle.Features:1.Clean energy,Environmental protection.No consumables needed,do not like the ice vest.2.Cooling fast with long time running.3.Do not worked by battery or ice.With long enough compressor hose, you can walk as far as possible.How to use:step one:For your own comfort, hang cooler to the belt provided.step two: After putting on the vest , link the cooler with the vest.step three: Link compressor hose to compressor hose joint of the cooler.step four: Than Adjusting knobs can be used to reach expected temperature.Pulling the discharge vent ,you can empty the Oil-water separating case.The Oil-water separating case can be screwed out and cleansing.With operating manual inside of package. Please see the operating manual in detail.