I was an Oakley fan for years, but switched over to Costas a couple years ago for their lifetime guarantee policy. I have a few pairs but nothing I could wear running; they're either too sporty (metal/aviator) or they're way too heavy.I saw these on Prime Day and I'd seen them recommended in a Facebook running group, so I decided to give them a try. I was concerned, though, that the lenses weren't going to be dark enough; don't they look a little on the light side? (I purchased the Sepia/Dark Brown Gradient.) I ended up doing a "Try Before You Buy" on a second pair (a different style) just in case these lenses didn't block out the sun.These came and I could not be happier. They are darker than what the pictures depict, but in a really good way. I ran in them and they were better than the Costas, but because the lenses so fully wrap around, it was hot underneath them. These are now my absolute favorite everyday sunglasses, and maybe I'll run in them in cooler weather. (FWIW, the other pair I purchased were the OO9191 Unstoppable model, and with the smaller half-lens with no bottom rim, they're absolutely perfect to run in and I highly recommend those as well.)TL;DR - These are incredibly stylish and very light-weight, and they also fit perfect. They don't slip, they don't snag, and the lenses don't fog. In the middle of Florida summer, they're a little hot to run in, so they can be your everyday sunglasses and maybe run in them in the winter, or try the Unstoppables for running and you'll be golden.