The thicker walled tubing and higher flow rate of the Cool Flow Heavy Duty Vest System (CFA-HD) make it ideal for use under protective clothing such as lead aprons. Keeps you cool by continuously circulating cool water throughout over 50 feet of insulated lines built into the lightweight vest. Just add water & ice to the cooler and your personal Cool Flow System is ready to go! System includes: Cool Flow Adjustable Vest (CFA), Fifteen (15) quart cooler with easy carrying handle, Nine (9) feet of insulated cool water lines (or five (5) feet if desired) from the cooler to vest, AC Power Adapter with grounded cord, and high flow, dry, quick disconnect couplings. Hook and loop straps on each side of the cooler keep the water lines in place for easy storage. Auto-drain accessory allows most of the water to be pumped from the cooler to a sink drain without lifting the cooler. Auto-drain attaches to the inside of the lid when not in use. Weighs approximately 32 oz. (2 lbs.) with water in the lines. Unisex, nylon-blend vest and may be worn under clothing or on top. Fully adjustable on the chest and sides and has a zipper-pull front. Can be worn standing or sitting. Dry, quick disconnect couplings allow freedom of movement. Color: Khaki. Sizes: M/L & L/XL. Rechargeable battery pack or auto power takeoff adapter are also available.