Promate Snorkeling Scuba Dive DRY Snorkel PURGE Mask Gear Set Package includes Promate 3-window purge mask (mk399) and dry snorkel (sk890) Lenses precisely fit to main lens for nearly uninterrupted field of view Soft 100% high-quality silicone rubber skirt Quick-Adjust ratcheting mask strap buckles Split mask strap design for increased comfort and fit