Cressi Adult Single Lens Mask for Maximum Vision While Scuba Diving and Snorkeling | Liberty Quality Since 1946 Mask features a wide unobstructed field of vision thanks to the one large lens. Lens made in tempered glass for safety Skirt made in hypoallergenic soft silicone, anatomically designed, for ensure a perfect seal Equipped with easy-to-use buckles for immediate length strap adjustment Easy-to-reach one-hand nose pocket for ear equalization usable even when wearing thick gloves The exclusive painted, coated frame brings a cool tech design style. Made in Taiwan