two glass mask ultra clear superior blackDo you want to see the beautiful underwater world in its true splendour? Then opt for our TG 50 two lens mask. The high quality ultra clear lenses of the TG 50 diving mask significantly improve your visibility under water as they have a light transmission of up to 94%. Unlike conventional float glass lenses, which have a light transmission of just 86%, ultra clear lenses don't have the green tint of standard glass. Our next generation ultra clear