Scalpel’s ear stems have a special design to keep these sunglasses in place. Here Unobtainium, which increases grip with perspiration, wraps round the ends and all along the underside of the arm. So Scalpel stays where it should be. And it’s comfortable too, made from lightweight O-Matter.This superior comfort is guaranteed by Three-Point Fit too. It means the frame only touches the head in three places.Everything is in its proper place with Oakley High Definition Optics. They don't bend light when it enters the lens. So vision is better defined. Peripheral vision is sharper too with Scalpel's 8.75 base lens curvature.