- 133
- 77
- Joined
- Aug 22, 2016
Ran a half marathon on Sunday in the 4%FK. The main thing for me is that the new model is not only quieter on foot strike, the wear is also better. In the original 4%, once you broke through the soft "exoskeleton" of the outsole, you got all sorts of odd flaking. The new version hasn't done that on mine after roughly 30 miles.