The IST MP201 PROTEUS Twin Lens Scuba Diving Snorkeling Mask offers the same great features as our BLUETECH (M88) mask, but provides a larger field of vision compared to its cousin. Despite the difference, the internal volume remains small because the lenses are brought closer to the eyes. A quality mask for use day in and out, or to keep on hand as a backup for friends and family to share, the PROTEUS’s lenses are made from super-transparent, tempered glass for maximum clarity, scratch-resistance and safety. Light and compact, low in profile and internal volume, PROTEUS has a soft, 100% hypoallergenic liquid-injected silicone skirt with a feathered edge seal that affords a comfortable, snug fit dive after dive, year after year. PROTEUS’s buckles are attached to the skirt, making it possible to fold the mask flat for compact packing and storage.Tempered-glass, scratch-resistant dual lensesTempered-glass, scratch-resistant dual lensesHypoallergenic silicone skirt resists pressureBuckles attach to the skirt for better fittingFold flat for compact packing, ideal for travelTinted lenses to correct colors and provide UV protection