are optical lenses optional? how much will it cost? (right: -4.75, left: -2.75)
Unfortunately this is not a mask we offer optics for. For a list of the masks we do offer optical lenses for you can visit: http://www.scuba.com/scuba-gear-53/Masks-Masks-w--Optical-Lenses.html
The skirt is made of very soft hypoallergenic liquid silicone, and its highly ergonomic shape makes it suitable for any shape of face. The reduced distance between the eyes and the lens guarantees excellent field of vision while keeping internal volume low. The system of pockets around the nose makes the skirt more flexible and makes equalizing easier. Soft- Touch inserts on the frame make it easier to reposition the mask.