I bought these on a whim after seeing all of my Instagram friends wearing them. I thought why not I’ll give them a try. Spring had finally sprung here in the Mitten state and was a perfect time to get some new glasses. My other pair bounced on my face and hurt behind my ears. I put these babies on and they were fantastic! Didn’t even know they were there. A few weeks later took them out to Cali to run a marathon. These sunglasses was the only accessory I had that did not cause me an issue in the 26.2 mile run. These are definitely the best running sunglasses around! Since then I have bought 3 more!!!