This is the Cressi Perla Mask Freediving Snorkeling Mask Features: Particularly Suitable for Free Diving and Snorkeling Appropriate for Use in Scuba Diving Two Tempered Glass Lenses 100% High Quality Silicone Rubber Skirt Double-Feathered Edge Skirt for a Great Seal on Face Mask Adapt to Most People's Faces Low Volume Mask Design Easy to Clear Mask Wide Field of Vision Wide Split Strap Provide Even Pressure for Great Seal Strong Rapid Action Buckles, Adjust Strap Quick and Easily Easy-to-Reach One-Hand Nose Pocket for Ear Equalization The Perla Mask is particularly suitable for free diving and snorkeling, but just as appropriate for use in Scuba diving. The Perla has two tempered glass lenses with a 100% high quality silicone rubber double feathered edge skirt for a great seal on the face, and will adapt to most people's faces. The Perla is a low volume mask that is easy to clear.