Is the desire to float if fallen because you can't swim or float if fallen and you can get to shore?

Reason why is that there is a well proven though unconventional floatation device you wear as a belt around your waist. This Beginner Triathletevideo shows what a Swimsafe device looks like. Swimsafe does not replace a PFD for boat safety but for personal use for out of the way carry its pretty good. To inflate you just pull the tab and it can be used multiple times by replacing the CO2 cartridge.