Type 3 wont turn you face up in most cases, buoyancy is as the type 2 but they are more of a flotation aid than a lifejacket. Think whats used on kayaks and canoes: simple vest, no collar kind of PFD (In Canada they make a difference between a lifejacket and a PFD, as per buoyancy and turning ability differences. AFAIK the USA distinguish too in between a lifejacket proper and a flotation aid kind of vest).
Life Jackets & PFDs | West Marine
NOTE:Changes in design and materials have made PFDs more wearable, but still boaters are not wearing these life saving devices. Statistics show a decrease in fatality rates of boaters drowning to a low of 517 in 2007. Out of the 517 drowned, 450 might have been saved if they had only been wearing a life jacket—a shocking 80%! Continued boating safety education programs on the national, state, and local levels, along with the efforts of the BoatU.S. Foundation for Boating Safety and Clean Water will help bring safer boating to all regions.
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Many years of extensive research and testing have earned the BoatU.S. Foundation a national reputation as a leader in PFD (Personal Flotation Device) safety. The "Foundation Findings" series of consumer tests has reported in depth on USCG-approved, inflatable, and children's PFDs. The information below is based on these reports, copies of which are free upon request from the BoatU.S. Foundation. In May 2011 the Foundation conducted a study of life jackets in general, including inflatables. This report is found at .
Inshore Automatic/Manual Inflatable Life Jacket Sale ..
2. A PFD may not roll a person into a position where their head is out of water. A lifejacket will hold the wearer in an upright position and in most cases, will roll a person from a face-down to a face-up position.A Type I PFD is also called an off-shore life jacket. It must provide at least 22 pounds (~100N) of buoyancy, must be able to keep an unconscious wearer face-up while in the water, must be reversible, and must be International Orange in color. They are intended for use where rescue is likely to be delayed. You will generally find them only on Naval and cruise ships, and are difficult to find in recreational boating stores. When you do find them, they are a bit more expensive.