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