Breathe Naturally While Snorkeling: Explore the oceans coral reefs with this next-generation all-in-one mask and snorkel. Designed to help you breathe naturally through your nose and mouth, the refined air flow and advanced purge valve system ensures optimal comfort, easy breathing, and fog-free undersea panoramic viewing while eliminating the need for a snorkel mouthpiece. It really is the perfect mask for surface snorkeling! Dry Snorkel Technology: Eliminating the need for a snorkel mouthpiece, this Full Face Snorkel Mask has an integrated dry snorkel tube at the top of the mask that stops water from getting into the mask. Natural Breathing While Underwater: The large diameter, single chamber snorkel tube with innovative multi-purge valve technology allows air to be easily inhaled and exhaled comfortably and naturally. Fog Free Panoramic View: Fresh, dry air is continuously directed across the inner surface of the mask, preventing condensation from forming and reducing fog providing an amazing panoramic view of the ocean. How to Measure for a Full Face Snorkel Mask: 1. Ask a friend to place a measuring tape with the 0-inch marker in the middle of your forehead just above the brow bone. 2. Measure from this mark to the lowest point of your chin bone, as shown with the red lines. 3. If the measurement is under 5.5 inches, choose the Small/Medium Full Face Snorkel Mask. 4. If the measurement is over 5.5 inches, choose the Large/X-Large Full Face Snorkel Mask. Additional Details ------------------------------ Department: unisex-adult