What type PFD has the most buoyancy?

The type of personal flotation device (PFD) with the most buoyancy is typically the Type I PFD, also known as an offshore life jacket. It is designed for maximum buoyancy and is suitable for rough waters, as it provides significant floatation support and can turn an unconscious wearer face-up in the water. Type I PFDs are often made from high-density foam and are ideal for situations where rescue may be delayed.