Omer Zero Cubed Dive Mask - Black The main feature of this mask is the field of vision which is almost completely non-impaired. The field of vision is 30% higher, compared to a classic free diving mask such as the Alien. The internal volume is so low that if a mask like the Alien is normally equalized starting at 25-30' depth, the ZERO3 doesn't require clearing before a depth of 60'. This makes for much more comfortable spearfishing particularly ad depth. Every detail on this mask has been conceived keeping in mind its design and functionality. The mask skirt features some milled surfaces that prevent the refraction of sunlight and make clearing easier, gloves dont slip when you hold the nose. The finish of the skirt which has a carbon fiber appearance was designed specifically to avoid glare.