Promate Snorkeling Scuba Dive DRY Snorkel PURGE Mask Gear Set Package includes Promate Pro Slender Purge Mask (MK285) and Cobra Dry Whistle Snorkel (SK680) 2-windows scuba dive (Rx-able) mask with purge function and channeled skirt design Mask buckles on skirt directly makes swivel function more flexible and may fits a wide range of face shapes, compact size to fit limited space. The fully submersible dry top snorkel with one way purge valve Built-in whistle housing and Quick slip-in snorkel keeper