Promate Snorkeling Scuba Dive Dry Snorkel Mask Deluxe Gear Set/ SCS0031 Package includes Promate Fish-Eyes snorkeling mask (mk260) and Cobra dry whistle snorkel (sk680) Slim mask frame, and foldable, flexible buckle attachment that swivel with facial movement Mask with unsurpassed downward vision and highest grade silicone for comfortable seal Mask push-button buckle allows for easy, quick strap adjustment Quick slip-in snorkel keeper. built-in whistle housing. Silicone purge valve for easy draining.