Mares Viper Free Diving and Spearfishing MaskViper Spearfishing Mask The Viper spearfishing mask features a reduced volume between the lens and eye, providing optimal visibility underwater. Its anatomical skirt has no internal border, ensuring maximum comfort during long apnea dives. The new silicone material effectively minimizes fogging, allowing for clear vision at all times. The strap is equipped with a simple and immediate ergonomic fastening system, ensuring a secure and comfortable fit.