Which is most important when selecting the right PFD for a passenger on board your boat?

When selecting the right Personal Flotation Device (PFD) for a passenger on board your boat, the most important factors include proper fit, appropriate type for the activity, and compliance with safety standards. The PFD should be snug but comfortable, allowing for movement without being too loose. Consider the specific water conditions and activities (e.g., kayaking, fishing) to choose a PFD designed for that purpose. Additionally, ensure the PFD is U.S. Coast Guard-approved for optimal safety.