Cressi Focus Custom Prescription Scuba Diving and Snorkeling Mask Made in Italy Customize your Installed Prescription Lenses by choosing one of our pre cut diopters for each eye -1.0 to -8.0 It's low volume, 2 lens design gives divers and snorkelers a proven combination of size and fit Swiveling quick adjust buckles Includes Tempered glass lenses for clarity and durability Made In Italy