Dive Rite UltraClear Frameless MaskDive Rite UltraClear Frameless Mask has the wide angle of vision provided by the single lens and by not having the frame of the mask over the nose substantially increases overall underwater visibility. Seeing clearly underwater over the entire field of view is possible with the ES155s ultra clear glass in its lens design. The glass is also tempered for safety if it should ever break. The ES155 performs throughout any length of dive by not only