This is the IST Pro Ear Scuba Diving Mask (Anti-Fog Lens version) for all around Ear Protection Features: Special tube and seal system automatically equalizes ear pressure as diver exhales into mask Prevents pressure-induced ear ache (barotrauma) Enhanced underwater hearing and sense of direction Watertight ear cups keep water out to keep ears warm and prevent infection Prior to the first time using, simply remove the matte protective film inside of the mask. Rinse with water before each dive for a better experience. Treat with care, avoid cuts, scratches, and high temperature. Clean with fresh water instead of detergent and cleanser. ISTs newest technology in Anti-Fog Lens Film eliminates foggy mask problems! This quality mask is a fantastic state of the art mask which is ideal for comfort and performance! Good for scuba diving and/or snorkeling.