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 F1 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. The Easy Access Nose Pocket can be used with one hand for proper Ear Equalization and the Single Lens Design affords a Wide Field of Vision. The Cressi Frameless Mask has a Wide Split Mask Strap Design for Comfort and to give Even-Tension on the Skirt for a Proper Seal. Mask comes with a Mask Box. The Cressi F1 mask is commonly used for Open Water Diving, Pool, Recreation, Snorkeling and more.. The mask is popular because customers like the following qualities of the Cressi: does not fog, high quality lenses, large range of vision, snug fit.