The truth of the matter is that the more like any given device is to save your life when you need it, the more bulky and uncomfortable its going to be to wear it when its not needed. If you want ultimate safety wear a type I PFD, if you want to be comfotable wear nothing. The range in between is where the problems arise. The sospenders and similar devices will save you if your are concious and can help yourself, if you get knocked unconcious nothing but a type I is goping to save you.
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