I’m going to start this review with a bold statement: the Nike Free 4.0 Flyknit is the best Nike Free shoe I have ever worn.
Writing that opening line is a big deal for me because the original Nike Free 3.0 remains one of my favorite shoes of all time. That shoe was lightweight, ultra-flexible, ran silent, and had a sock-like upper that was about as near perfection as a minimal shoe upper can get. My only complaint about the 3.0 v1 was that it was a bit narrow. The new 4.0 Flyknit matches the original 3.0 on all of the positives, and improves on it by having a much wider toebox. It’s an amazingly good shoe.