Nike React Infinity Run Flyknit 3

Nike did not market it as a traditional medial-post stability shoe, but its broad base, sidewalls, and heel clip add guidance. It can suit some runners wanting mild support, but flat feet alone do not determine the correct shoe.

No. It uses a full-length React foam midsole with a rocker-like shape, not the carbon or nylon propulsion plate found in plated racing shoes.

It is best suited to easy runs, recovery miles, walking, and steady daily training. Its cushioning and substantial construction favor comfort and stability over lightweight racing speed.

The InfinityRN 4 replaced React foam with the softer ReactX formulation and substantially revised the upper and ride. Runners who like the firmer, more structured feel of the Flyknit 3 may not consider the fourth model a direct match.