CRESSI's New F1 Mini Frameless Mask is Lighter, Lower in Volume and offers a More-Compact Profile than a Traditional Mask. Its Single Tempered Glass Lens provides a Great-Field-of-View. The Hypo-Allergenic Silicone Double Feathered Edge Skirt Molds to All-Facial Contours, and is effective in Blocking Water Entry. Push-Button Strap Buckles Attach-Directly to the Skirt which allows for lots of Lateral as well as Vertical Movement, plus it lets you Fold the Mask Flat for Packing. The Wide Split Strap Tighten Easily with a Ratcheting Action Push-Button Buckle Design.