Have used these Nikes back in 2015 ( Nike Free 4.0 v3). Personally loved the comfort of these shoes. I can't find these anymore where I live ( not in the US).
Keeping it Classic: Nike Free 4.0 Flyknit - Black / Wolf Grey • KicksOnFire.com
Nike Free 4.0 Flyknit White Black Men's - 631053-100 - US
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Nike Free Run 4.0 Flyknit Size 10 In Black - clothing & accessories - by owner - apparel sale - craigslist