What pfd is designed to turn most unconscious persons face up?

The personal flotation device (PFD) designed to turn most unconscious persons face up is called a "Type IV PFD" or "throwable PFD." These devices often include features like buoyant collars or straps that help maintain an upright position in the water. Additionally, some "Type III PFDs" are also designed with this capability, providing comfort and support while ensuring the wearer remains face up. Always check the specifications and safety ratings to ensure proper use in emergencies.