The Cressi Frameless Masks are loved by many Scuba Divers and Snorkelers for their Low-Profile and ability to Fold-Flat for easy carrying, 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.