UM-31 Mask offers an ultra-wide 168-degrees panoramic view through 1 window lens; Patented domed side windows; Reduced frame structure to reduce blind spots; Patented round edge skirt for increased comfort and better seal; Three-dimensional strap for unprecedented fit; Five-position strap angle adjustor for micro-adjustment; USP-250 Snorkel with Pure Silicone Flex-Neck and Mouthpiece; Patented Hyperdry Elite Dry Top Technology; Large capacity drain chamber and purge valve for easy clearing; Ortho-consciously designed mouthpiece for ultimate comfort