This revolutionary mask is made from high seal, a new material that offers extraordinary and unprecedented comfort. Not only has this new high seal 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 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. Big eyes evolution has been created to take prescription lenses. The big eyes evolution packaging can be completely recycled and the lower black part has been made from recycled material: cressi also cares for the environment! Special snorkel with a special patented ÒaquastopÓ valve at the top that keeps water out, making breathing easier and more natural. The tube has an expanded elliptical shape in order to increase comfort and air-delivery capacity. Purge valve and corrugated section near the mouthpiece