The outsole of the Zoom Fly is built for racing. The front half of the trainer is covered in rubber, and the heel has some rubber strategically placed. This outsole is relatively smooth. I enjoyed pairing the Zoom Fly with the Vaporfly 4% for my training.

This shoe is a speed day trainer that would work for tempos, intervals, and racing. For $160, you can get 300 to 325 miles of life out of it, which is a pretty appealing offer for someone who doesn't want to break the bank and spend $250 on the Vaporfly or $275 on the Alphafly for only 250 miles of use.

I used the Nike Zoom Fly 4 as my training shoe on most of the runs while training for the half marathon I ran in Ljubljana. I did a few easy runs in the shoe, a few tempo runs and 2 long runs, one of them a long run workout.

Powered for Speed. A carbon fiber plate sandwiched between layers of Nike React foam is super lightweight yet strong. It delivers a speedy, snappy feeling, helping you keep up a quick pace.