The facial is highly adaptable to the face, with excellent lip overlap. The geometry of the dimensions and the inclination of the lenses complete a clever blend of design and performance.
An internal volume of 94 cm3 and a total field of vision of 658 cm across the eight cardinal points make this the best mask ever made.
C4 puts an end to the problem of diving mask fogging by introducing some mask models equipped with special films applied to the inside of the lenses. These films prevent fogging in any situation, provided a few simple instructions are followed.
The inner edge of the skirt features a very large contact area and a unique continuous and convex curvature that seals and adapts the skirt perfectly to the face.
Using Frameless technology, the lenses were able to be brought closer to the eyes. The shape and position of the lenses were defined thanks to a dedicated study, taking into account the various human interpupillary distances. The nosepiece features a system of differentiated thicknesses that makes it perfectly adaptable and ideal for equalization.
C4 puts an end to the problem of diving mask fogging by introducing some mask models equipped with special films applied to the inside of the lenses. These films prevent fogging in any situation, provided a few simple instructions are followed.
Packaged in a cardboard box

Note: The lenses of any mask—with or without anti-fog treatment—can fog if contaminated by dirt or if not cleaned properly.
Anti-fog-treated masks are designed to eliminate the need for the initial treatment normally required for all new masks. This treatment removes residues of silicone oils and greases used in the molding of silicone skirts. These residues are the main cause of fogging and are often difficult to remove, even after repeated cleaning.

It is important to underline that anti-fog masks are equipped with internal films applied directly to the glass, which constitute the anti-fog system itself: these films must not be removed, scratched or tampered with in any way, as altering them would compromise the effectiveness of the treatment.
It should also be remembered that an anti-fog mask can still fog up if the internal surfaces are not kept adequately clean.