Thenice Surface Snorkel Scuba Set Sports Snorkeling Mask (Green) 100% Brand new and high quality Easy breathing: It cover all of your face, looking cool and scientific, and naturally breathing through nose or mouth. Fogging Reduced: Exclusive breath ventilation design reduces fogging. Water Seal: Dry Top snorkel system prevents water coming through the top of the snorkel. Easy to apply: Adjustable elastic strap for different head size. Wide Angles Vision: 180 degree vision