Cressi Adult Dive Mask with Inclined Lens for Scuba Diving - optical lenses available | Big Eyes: made in Italy Raked lenses provide excellent field-of-view Inverted tear-drop lenses improve downward visibility for managing bc-mounted gear Low internal volume allows for effortless clearing High-grade silicone resists aging and skirt discoloration and a leak-free seal Quick-adjust swivel buckles