The Original Full-Face Snorkel Mask. The Seaview 180° combines unique features with great style for a better snorkeling experience. See more, stay out longer, and enjoy more sea creatures. We've established ourselves as an industry leader by maintaining the highest product standards. We have meticulously tested and designed the Seaview 180° for optimal performance, using only high grade materials. We've spent years refining our design for perfect fit and comfort, optimal snorkel length for maximum air-flow, and refined lens shape for unmatched underwater visibility. The durable silicone insert creates a comfortable watertight seal that will keep you snorkeling all day. Any water that does get in simply drains out the one way chin valve when you tilt your head back.