The Oakley Crankshaft is a combination between the classic Gascan and Fuel Cell frames. The Oakley Crankshaft is composed of Oakley’s O Matter stress resistant material for greater resistance. The Crankshaft is perfect for medium to large faces and comes standard with the three-point fit for optimal optics. Features include: O Matter frame, three-point fit, prescription ready. The Oakley Crankshaft is one of many Oakley prescription sunglasses that we have available.