Cressi A1 Mask w/ Anti-Fog LensA1 Mask w Anti Fog Lens Say goodbye to mask fog these masks are fog proof. Seriously, fog proof. The A1 has been designed with an attractive style, boosting high performance for scuba diving and free diving alike. It features a single lens made of tempered glass with a special sun ray protection to better protect your eyes. The lenses are inclined and have an inverted teardrop shape, increasing the downward visibility. This allows for better control