Which type of personal flotation device is NOT designed to turn an unconscious person face-up?

Type III personal flotation devices (PFDs) are designed primarily for comfort and mobility rather than providing guaranteed face-up flotation. These devices are suited for activities like kayaking, sailing, or fishing, where users may be expected to be active in the water. While they do offer some buoyancy, they do not have the inherent design features that stabilize an unconscious person in a face-up position.

In contrast, Type I and Type II PFDs are specifically designed to keep an unconscious person face-up in the water, which is crucial for safety in emergency situations. Type I PFDs provide the most buoyancy and are ideal for rough or remote waters, while Type II PFDs are designed for calmer waterways and may not offer as much buoyancy as Type I. Type IV PFDs, typically throwable devices, are also designed to assist individuals who are in distress but do not provide a worn flotation solution. These distinctions highlight the functional differences among the types of PFDs, with Type III being the only one not intended for full support in a life-threatening scenario.