The Cressi Liberty Duo Perfect View Scuba Diving and Snorkeling Mask features 2 big, inverted-teardrop lenses to ensure a complete view. You'll get better optics on your surroundings as well as your equipment, with reasonable internal volume for better clearing and a lower profile in the water. The tempered-glass lenses provide the best clarity and are joined in a way that minimizes the visible seam. An excellent choice for both diving and snorkeling, the Liberty Duo provides improved vision and comfort over previous multi-lens masks. The skirt and strap are made with hypoallergenic silicone to ensure comfort and a perfect fit. The buckles allow immediate length adjustment with 1 hand, even while wearing gloves. The frame is colored with a beautiful metallic spray effect. Mfrs. 2-year limited warranty. Dual inverted-teardrop lenses Tempered-glass lens construction Hypoallergenic silicone skirt and strap Easy-adjust buckles