I'm using Rudy Project "Exception" glasses for riding and driving. This system has Rx inserts and snap-on/off outer lenses (they also flip up). I use the transition outer lens when its mostly cloudy and at night. They transition to about 50%-60%. I snap in the 90% lenses when the sun is very bright. I also use the amber outer lens for cloudy days. The frame is very comfortable, adjustable and rugged. Some of the outer lenses are impact proof.