Scubapro Crystal Vu Plus Dive Mask with PurgeCrystal Vu Plus Dive Mask with Purge The CRYSTAL VU PLUS's large single lens design plus seamless side windows equal an expansive view under water, and the no tint glass makes that view extremely clear. Offering new styling with low internal volume, the crystal clear double sealed silicone skirt offers a seal that is both comfortable against the skin and watertight while producing a very open, airy feel that's especially nice when diving in darker