Not only has this Cressi Crystal Silicone been chosen, with its exceptional softness and comfort, but the entire design of the skirt has followed new rules which allow a point of contact between the mask and the face that has a very open angle. The skirt is made with top quality Crystal SiliconeTM, Cressi's trademark formula to avoid yellowing after years. In the front part, the skirt has a structural silicone insert which increases the sealing ability of the mask and creates an exceptionally pleasant chromatic play. The mask rests on the face with unprecedented comfort and does not leave any marks on the skin, even after extended use. Naturally, to obtain such a result the entire structure of the skirt is differentiated, with internal ribs that stiffen the parts of the mask that are most stressed. The ultimate in comfort and performance, the Big Eyes Evolution Crystal combines the best of Cressi technologies. Raked lenses, with Cressi?s inverted tear-drop shape, are placed close to the eyes for an exceptional field of view, and the Crystal Silicone skirt delivers excellent light transmission while resisting discoloration and fogging. The Crystal Silicone skirt also seals gently against the skin with a very open angle that accommodates a wide range of facial shapes.