I have three of the auto inflatable vest and love them. they are lite weight and after a while you for get you have it on. I often wear mine under my rain jacket. last year me friend cliff wanted to test his vest. He sat on the side of the boat and just fell in like he was unconcious. the vest inflated so fast he hardly got his hair wet. I mean it just poped like a cork. i would not go out with out one , and my wife makes sure i don't.