Land & Sea Clearwater Black Silicone Mask & Snorkel SetThe Land and Sea Clearwater Black Silicone Snorkel Set twin lens mask allows superb visibility while the non allergenic vision enhancing black silicone skirt provides excellent fit and seal against water penetration. The vision enhancing black silicone skirt eliminates peripheral refracted light allowing your pupils to open further and accept only the light source emanating from the immediate field of vision. Your eyes are then able to register a