TUSA Visio Tri Ex Scuba Diving Mask 3-D strap for unprecedented fit, 5-position strap angle adjustor for micro-adjustment Patented round edge skirt for increased comfort and better seal Soft, flexible, hypoallergenic silicone skirt for a comfortable, snug fit Reduced frame structure to reduce blind spots 168 panoramic view via TUSAs patented domed, side-mounted lenses