These sit perfectly on my nose and never slip, even when running. They look great as well (but beware everyone can see you roll your eyes through the relatively sheer lenses). But the absolute best thing is how crisp and clear everything looks through this chromapop lens. Every person I’ve let wear them has gone shopping for a pair. I should probably try to sign up to be a Smith ambassador at this point. My polarized Ray Bans are collecting dust...