A PFD, or personal flotation device, is a flotation device in the form of a vest or suit that is worn by a user to prevent the wearer from drowning in a body of water. PFDs are also referred to as life jackets, life preservers, life belts, Mae West, life vests, life savers, cork jackets, buoyancy aids, or flotation suits. They are commonly worn on small watercraft or other locations where accidental entry into deep water may occur in order to provide immediate support for the wearer should they end up in the water. PFDs are also kept on large vessels for passengers to wear in an emergency in order to help them stay afloat should they be forced to enter the water or accidentally fall overboard during an evacuation.

There are five main types of PFDs that should be used depending on the boating environment or situation. These include:

• Type I: Offshore life jackets that are designed to turn an unconscious person face-up in the water and provide the most buoyancy. They are best for rough or remote waters where rescue may be delayed.

• Type II: Near-shore buoyant life jackets that are intended for calm inland waters where there is a high likelihood of a quick rescue. They are less bulky than Type I and many will turn an unconscious person face-up in the water.

• Type III: Flotation aids that come in a number of styles that suit different water activities. They are designed for calm waters and are not recommended for open or rough waters.

• Type IV: Throwable devices such as buoyant cushions or rings that can be thrown to a person in the water.

• Type V: Special use devices that are designed for specific activities such as kayaking, windsurfing, or water skiing. They are not recommended for general boating activities.

When selecting a PFD, it is important to consider the brand and the circumstances for which it was designed. Ultimately, the best PFD to wear is the one that feels the most comfortable, as this factor is likely to increase its usage.