This is the Promate Super Sonic 2 Lens Adjustable Snorkeling Scuba Diving Mask Features: Ideal for smaller faces Crystal, liquid silicone injected skirt and strap Double edge comfort seal Low volume Swivel and adjustable buckles Broad peripheral view Tempered glass Optical lenses available from -1.0 to -8.5 by increments of 0.5. Please note there will be an additional 2 to 3 days processing time for most RX lenses For more information on prescription lens options, see Item RX005 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. Promate Micro Prescription Dive Mask for Smaller Faces. Returns are not accepted for used lens. Only unused lens are eligible for return with store credit.