Take ultra low profile 16 lb Descente to 21 lbs buoyancy in a few seconds. A compact, weightless accessory slips into and lays flat against the back side of the Descent front pocket compartment. Once positioned, inflation hose valve end lays ready to use at the bottom of special "garage" compartment up top, and close to your lips. Float bag style shutoff valve lets user add just a little or a lot....up to 5 lbs of additional frontal lift. Front pocket neoprene compartment stretches to accommodate fully inflated Add-A-Buoy. Fully illustrated instructions included