The reservoir located below the mouthpiece keeps breathing path clear of excess water.;In the rare event that you need to clear the Impulse 3 Snorkel, almost no breath is needed. All it takes is an easy puff.;The unique design of the Impulse 3 snorkel, with its large bore, delivers extremely low breathing resistance while the body of the snorkel creates little drag.;Available in a FLEX version that allows the patented COMFO-BITE mouthpiece to drop out of the way while switching from snorkel to SCUBA.;The non-flex version has a swivel design that allows optimal mouthpiece positioning. Patented Comfo-bite mouthpieces, which eliminate jaw fatigue, are replaceable and an optional, smaller size is available