The oakley crowbar mx goggles have been built around an o matter frame which are both lightweight and flexible and have been combined with pure lexan for impact protection and strength which is what makes oakley goggles a high demand by many of the worlds top riders while meeting ansi z871 and en 1938 standards the clear lenses featured on some of the oakley crowbar goggles use f3 anti fog treatment allowing the optics to maximise your range of peripheral and downward view enhancing your visio