The first test for any eyewear for me is how they sit on my face, i can't stand sunglasses when the bottom of the lens touches your face, that's an instant never wear again decision for me, both the 502 and 504 model of Rad8 pass this test. the 502 is a more traditional design for cycling
I also have the fixed tint versions to try, but as we are coming out of winter into spring unfortunately we just haven't had the brightness to warrant them so far.
and to stop mud and stones from flicking up from the front wheel into my eyes and disturbing my vision and at worst damaging my eyes. when my normal lenses steam up i end up removing them to be able to see where i'm going, not ideal in this environment of flying debris and insects.
so i'm very glad to report that the Rad8 anti fog coating really works, it does't stop the fogging entirely but it does a great job. I'd say i get 90% less fogging them my usual eye wear. the other top feature is that if they do fog they clear at a much faster rate than any other pair of glasses i've worn
I've ridden 100k on a road bike with these too and even in the more extreme road riding position my vision wasn't compromised by the full frame design.
these are my go to eyewear for every ride. the fact the look cool to is an added bonus.
you can find all the Rad8 products here http://www.rad8.co.uk/ and maybe even apply to be an amassador your self.