Scuba Diving Snorkeling Panoramic Side-view Mask Patented single lens with Edgeless technology on sides, which increases field of vision dramatically. Patented channeled skirt design directs bubbles away from view. Ideal for medium to large faces | Crystal, liquid silicone injected skirt and strap. Double skirt edge comfort seal. | Low volume. Swivel and adjustable buckles. | Tempered glasses.