Inflatable PFDs offer rowers protection without the bulk of traditional lifejackets. They’ve been around for almost thirty years now and are used for everything from commercial fishing and military applications to recreational boaters. USCG approved models all include a pull cord mechanism to inflate the PFD and many also include auto-inflation mechanisms that activate under hydrostatic pressure; i.e., they can’t be activated by rain, but require the pressure of actual submersion. They are not for children or non-swimmers. Inflatable Belt Packs are designed to be worn around the waist and they inflate, if needed, with a pull-cord. Rowers who use them tend to wear them behind the back and forget they’re there.