p-flash

These are great glasses, but the fit is a little small and I have a small to medium-sized face. They definitely stay on your face during all activities (especially trail running)which is a good thing and why I purchased them in the first place. My problem is they don't sit on my nose properly, so if you have a small nose, beware. That said, the rubber bumpers keep them from jumping around despite not fitting my face so great. The optics are amazing. I also forget that I have them on. I have a hard to fit face, but if you don't these are the sport glasses for you. If you have a small nose with no bridge, they will probably not fit like most of your other sunglasses, but they will stay on your face and not slip off during trail running.