Made of ULTEM, the Oxygen frames are light as air, very flexible, and very durable. These styles either have comfort-fit AF nose pieces or nose pads that can be adjusted. If you like the plastic frame look but not the weight of plastic, these are for you! At $79.00 they are $80.00 less than our LOUISLUSO designer line!! This video shows the amazing properties of ULTEM for the LOUISLUSO line. The material is exactly the same.