Great shoes for running. Possibly the most comfortable shoes I've ever had. My only real complaint is durability. In their quest to create the lightest shoe, they pared down some fundamentals that could have made a world of difference. A little more rubber on the outsole would have been a lot lighter without adding much weight. As a result, there are few rubberized grip points that wear out quickly, so you end up walking right through the foam. Also, the fabric started to fray over my big toe and on the outside of my foot. If you plan on changing your running shoes every 2.5 months it will work, but I wouldn't expect more if you run regularly.