What type of PFD will turn most unconscious persons face up in water?

A Type III Personal Flotation Device (PFD), specifically designed for comfort and ease of movement, is often effective at turning most unconscious persons face up in the water. However, a Type I PFD, which is a more buoyant and inherently stable design, is the best choice for this purpose as it provides the highest level of flotation and is designed to keep the wearer’s head above water. It's essential to ensure the PFD fits properly and is rated for the wearer's weight for optimal performance.