I've had the Nano 8 for almost 3/4 years and thought I'd buy a new pair. They still work, just a bit worn. These new X1s bothered me at the back of my foot but eventually broke. Not only did they get used to them, but they broke after about a month of use. Extremely disappointing, can't return them or anything. Stay away from these shoes, half of these reviews should be from people who don't actually exercise or train in them.
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