U.S. Divers Adult Magellan Purge LX Mask/Tucson LX Snorkel (Black) 2-window mask with hypoallergenic silicone face skirt for ultimate comfort Built in purge valve keeps mask clear of water Silicone Squeeze buckles for easy adjustments Submersible dry top snorkel with purge and safety whistle Hypoallergenic silicone mouthpiece for comfort and durability