Slightly off topic..but.. A whistle attached to you (wearing a PFD or not) is something to consider. If I hear a whistle, I'm going to check it out and move in to help. Never underestimate the value of a PFD. But if other people are in the area, a cheap, plastic whistle can be even more valuable. PFDs are great. But summoning help is often needed, even when you have the best PFD money can buy.