Silicone crystal, an incredible new frontier in the world of transparency. It is long-lasting and won't turn yellow, and thanks to its special chemical composition it drastically reduces the irritating effect of lens fogging. An absolute cressi exclusive. Evolution skirt: to obtain a similar result, double injection technology was used to create the structure of the skirt. This technology is a new dual-injection system that can differentiate the stiffness of the skirt at each point, making it stiffer where needed for a crush-proof structure, and softer where the most comfort is required. The angled lenses, moved as near to the eyes as possible, have increased the matrix's already incredible view by 25%. The ring capitalizes on cressi's exclusive patented dual-injection of an elastomer onto a rigid element, which makes it possible to avoid mounting the strap buckles on the structure of the skirt like the competition. Instead, they are mounted on a flexible and indestructible element that pivots on a vertical plane and can be folded completely sideways over 180°. The ring is thinner, in fact even thin enough to disappear completely from view when you wear the masks. Tempered glass lenses. Option for graduated corrective lenses from -1 to -6 diopters, including half diopters.