I heard that the heel collar is problematic and can cause irritation. Thankfully, I had no such issues and find this shoe excellent for all paces and distances. It could even be a solid racing shoe if you're not particularly fast (like me). Fit is generous throughout and I have a wider foot. Tread wears out a little faster than expected, but it doesn't seem to compromise grip or performance. Went true to size and am very pleased!
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