I bought these sunglasses specifically for running. So far so good. A tight fit on my slightly large head but not uncomfortable. Just the two runs to date and absolutely no movement of the sunglasses on my nose when running on the roads which was my main concern. Lenses did not steam up thanks to the vents, worked well to deflect the strong headwind from my eyes and they also blocked out the sunlight which is ultimately what a pair of sunglasses is for. Hardly noticed I was wearing them as time went on due to their lightweight design. Unfortunately these sunglasses didn’t enhance my running performance but you can’t have everything!