SDJ wrote:
There is a big difference and it’s really up to you. Midsole - Zoom Fly is Lunarlon or EVA based foam. The 4% and SP are pbax - The pbax will feel alive, the Lunarlon does not.
Upper - Zoom Fly is fliyknit with Flywire - More secure fit through the midfoot, slightly more structure in the toe box. The 4% and SP simply have much less structure.
Results - I don’t know anyone that has used both and preferred the Zoom Fly over the 4%.
Thanks Dave, Does the fly sp have more support/heavier than the 4%? I don't think the 4% would be quite enough shoe for me.