This is the Cressi F-1 Frameless Mask ScubaDiving Snorkleing Mask Features: Low-Profile Design Folds Flat for Easy Carrying: Fit in BCD Pocket High-Grade Silicone Skirt Bonded Directly to Lens Single Tempered Glass Lens Low Internal Volume for Effortless Clearing Double Feathered Edge Skirt Quick-Adjust Strap Buckles Buckles Molded Directly to Skirt for Flexible Fit and Reduced Drag Easy Access Nose Pocket for 1-Handed Ear Equalization Wide Field of Vision Wide Split Mask Strap for Improved Seal on Face Frameless masks are loved by many divers for their low profile and ability to fold flat for easy carrying, even in a BCD pocket. Cressi's Frameless Mask design bonds a high-grade silicone double feathered edge Skirt directly to a single tempered glass lens for the ultimate in simplicity. The low internal volume allows for effortless clearing and the quick-adjust strap buckles are molded directly into the skirt for a flexible fit and reduced drag.