This is the Promate Pro-Scanner Purge Scuba Mask - Optional Prescription Lens Available Features: Ideal for medium faces (fits almost everyone) - face seal size W4 1/2 * H3 3/8. Unique purge design design. Crystal, liquid silicone injected skirt and strap. Double edge comfort seal. Ultra low volume. Broad peripheral view. Tempered glasses. Please note there will be an additional 2 to 3 days processing time for most RX lenses This Quality Scuba Diving Mask is a fantastic state of the art mask which is ideal for comfort and performance! Good for scuba diving and/or snorkeling. Returns are not accepted for used lens. Only unused lens are eligible for return with store credit.