Something is clearly wrong with the back of the shoes near your Achilles tendon. It was extremely painful and blistered after my workout. I had on thin ankle socks and it was still painful to walk in these. I had to cut my treadmill session short! The shoelace is also too short. The front part of the shoes is perfect in terms of width and balance but I could hardly walk to my car after receiving blisters at the back of my ankles. I am stressed because I am now left with blisters, a waste of money. I can't wear this for more than 15 minutes.
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