The frameless Crew Mask are made from the direct bonding of the silicone mask skirt to the tempered glass. By eliminating the thick plastic frame, the frameless masks are lighter, lower in volume, and more streamlined. As a class, they enjoy more popularity than ever before. • Large single window for unobstructed view • Easy-to-adjust ratcheting buckles • Double, feather-edged sealing skirt • Made of hypo-allergenic silicone for comfort and longevity • The Glacier Blue model is clear silicone