What is sizing for PFDs based on?

Sizing for personal flotation devices (PFDs) is based on body weight and chest size because these factors directly affect how well a PFD will fit and function in water. A properly fitting PFD ensures that it will keep a person afloat and provide adequate buoyancy while being worn.

Body weight is critical in determining the buoyancy required for the PFD to support the wearer effectively. Individuals with different weights may require different PFD models to ensure they are buoyant enough to prevent drowning. Chest size is also important because it affects how snugly the PFD fits. A PFD that is too loose can ride up in the water, potentially compromising safety, while one that is too tight may be uncomfortable and restrict movement.

Other choices, such as age, experience, skill, gender, or height, do not directly correlate with the functional safety and buoyancy needs determined by weight and chest measurements. While they may have some relevance in specific contexts, they are not the primary factors established by standards for PFD sizing.