Pulling on the Kokatat Sea O2 Personal Flotation Device front tab releases a CO2 cartridge into the hidden internal air chamber and inflates this PFD for added flotation. While the Sea 02 Personal Flotation Device provides 7. 5lb of buoyancy without air, it increases to an impressive 22. 5lb when inflated. Kokatat added a manual inflate valve to conserve CO2 or to be used in emergencies. More along the in the boat side of things, this PFD comes with a mesh back to add comfort while paddling, and two front pockets hold all your on the water necessities.