Body Glove knows that not everybody has perfect vision. They also know that their love for the marine environment should not be left to only those who have good eyesight but should be enjoyed by those whom don't. Body Gloves Corrective Optical Mask is designed for the 20 million potential snorkelers and divers with nearsighted vision. This clear mask features a top-quality silicone rubber facial skirt with a double feathered edge and a wide split style strap design that combine for superb fit and comfort. Mask is equipped with an easy-to-reach one-hand nose pocket for ear equalization which can be utilized even when wearing thick gloves. <br><br> This dual lens low volume mask is equipped with tempered glass lenses that meet the rigorous ANSI standards. The dual lens design provides a wide field of vision. With easy adjust pivot non-corrosive buckles with flexible hinge for extra comfort. The mask is available in three Diopter strengths: Mild (-0.5 to -2.00) medium (-2.5 to -4.0) or strong (-4.25 to -6.0), you can now share the beauty of the marine environment with increased vision.