Phantom Aquatic's Panoramic 3-window Mask Patented Tri-Window Design has Seamless Side Windows for an Unobstructed View. With its Revolutionary Push-Button Buckle for Easy and Quick Strap Adjustments, with Foldable and Flexible Buckle Attachment that Swivel with Facial Movement ensures a great Seal Regardless of the Diving Conditions. The Trio C Mask is a Low Volume Mask with a Double Feathered Edge Silicone Skirt and Wide Split Strap that combine for a perfect Fit on the Face. The Mask places the Lenses Closer to your Face providing a Superior Field of View.