Aqualung Cobra Dry Snorkel with Safety Whistle, A unique dry snorkel Patented upper valve keeps water from entering the snorkel. Allows air to easily enter snorkel for clean and unobstructed breathing. Specially designed cover guards against water splashing into the snorkel. When the dry snorkel is submerged in water, the patented hinged seal reacts to seal the snorkel, preventing water from entering. As you surface, the hinged seal swings open allowing air to enter. | Aqualung Excel Frameless Mask, Maskwear that keeps you focused. Sleek 100% liquid silicone skirt attached directly to the tempered glass lens. the Aqualung Excel Series offers an incredible field of vision and packs flat.