U.S. Divers Lux Purge Grenada LX Snorkel Mask Panoramic lens technology for expanded visibility with hypoallergenic silicone face skirt for ultimate comfort Submersible, Dry top snorkel - designed to keep water out of the breathing tube above and below the surface of the water Ergonomic silicone mouthpiece provides comfort and reduces jaw fatigue Flex section maximizes comfort and improves fit. One-way purge valve and built in whistle With go Pro ready camera mount