buy these with EXTREME CAUTION - depending on your running style and how quickly you're going to start upping the distance. I appreciate I was stupid, but I started using these when training for a marathon as I realised I was a fore foot runner and was in what I thought were clumpy big air max's. BIG MISTAKE! They probably are the right type of shoes for my running style, but NOT for big distances until you are well used to them (I reckon a good few months before you attempt longer distances (that's if they're good for long distances (15 miles +) at all. I ran a 14 mile run and old knee problem re-occurred after being dormant for 8 years. Next week I did 17 miles and knee got really bad and I got really bad tendonitus on my right foot and my foot swelled up massively and great pain!! It's all down to the lack of support and foot not ready for that mileage on minimal shoe. In hindsight I was trying to seek out flat road as I could even feel my foot jarring on slight slopes. Hope this helps!