Made form Crystal Clear High Seal Hypoallergenic Silicone, the Cressi Evolution Crystal Big Eyes Mask offers unprecedented and extraordinary fit and comfort. It stays on diver’s face with the Silicone Rubber and leaves no residue on it. With an absolutely natural structure, internal ribs stiffen the most stressed parts of Mask. Designed to offer exceptionally wide View Field, the matrix mask adds to viewing access by 25%. The Dual Tempered Raked Glass Lenses rest closer to eyes. Exclusively patented Mask Strap is easy to bend sideward up to 80° curve. Additional features of Cressi Evolution Crystal Big Eyes Mask include: practically invisible thickness of Mask Frame, Double Feathered Mask Skirt, and One-Hand Easy-Access Ear Equalization Nose Pocket. The snug-fit Big Eyes Mask is perfect for Snorkeling, Recreation, Pool, Diving, and many more.