Promate frameless Mask for scuba diving snorkel with mask protective box Frameless Design Lowers Internal Volum - Face Seal Size W4 3/4 * H3 1/2 TearDrop Lens Shape for Increased Downward Vision; Narrow at Temples - Wide at Eyebrows for Upward Vision. Strap Buckles are Molded to the Soft Silicone Skirt for Improved Comfort and good Fit. Molded Ridges Around Lens for Improved Grip Come with mask protective box; clear plastic case and lid great for storage and traveling.