Cressi Adult Patented Inclined Inverted Teardrops Lens Mask for Scuba, Snorkeling, Freediving | Big Eyes Evolution: made in Italy This revolutionary mask is made of High Seal Silicone, a material that offers unprecedented comfort and a perfect seal ideal for scuba diving, snorkeling, and freediving. The raked lenses, with their inverted drop shape (Cressi patent), are quite small and are inclined as close to the eyes as possible to improve the downward visibility. The lenses may be replaced with prescription optical lenses ideal for myopic. The frame uses the exclusive patented Cressi system of double injection of an elastomer on a rigid element. The buckles are mounted not on the skirt structure, as done by our competitors, but on an indestructible elastic element that allows the buckle to The mask is made using the IDF system. The Integrated Dual Frame is a technology that consists of the joining of two rigid frames producing a drastic reduction in the internal volume. Patented by Cressi US 20140013494 A1. The thickness of the frame has been reduced to such an extent as to make it practically invisible when the mask is being worn. The Big Eyes Evolution comes with a reusable hard plastic case to protect it during travel and to store it when unused. The mask is designed and made in Italy by Cressi, a brand pioneer in scuba diving, snorkeling and freediving equipment.