Nike React Infinity Run Flyknit 3: fit, review and price

The Nike React Infinity Run Flyknit 3 is a road running shoe designed for easy runs and longer distances. It combines a cushioned React midsole, a curved sole and a Flyknit upper that wraps around the foot. Its main strengths are heel stability and the transition through each stride, rather than the low weight needed for fast running.

Released in 2022 with a reference price of €160, it belongs to an earlier generation of the range. Its close fit, pronounced arch and weight are important considerations before choosing it, particularly if it turns up in a clearance sale or on a resale site.

Specifications and measurements: what the numbers mean

The published specifications list a weight of 309 grams and a 9-millimetre drop. Drop is the difference in height between the heel and forefoot: it affects the shoe’s geometry, although it does not determine on its own how a runner will land.

In published lab tests, the shoe weighed 297 grams, compared with an average of 261 grams across the shoes measured. The difference from the listed figure could be due, among other factors, to the size tested. Either way, it is not an especially light training shoe.

The same lab measured 30 millimetres at the heel and 23.3 at the forefoot, giving a drop of 6.7 millimetres rather than the 9 millimetres in the published specifications. These figures help compare geometry; they do not directly establish how much cushioning each person will feel.

Forefoot energy return measured 58.7%, compared with an average of 61.5%. The figure describes how the foam behaved under the test conditions; it is not the percentage of energy a runner recovers while running and does not predict performance on its own.

React cushioning and the transition through each stride

React foam runs the full length of the midsole. Its volume is designed to spread impact during training, while the curved sole shape, also known as a rocker, helps move the foot from landing towards toe-off. The bevelled heel and raised toe contribute to that geometry.

The combination is intended for comfortable mileage rather than the explosive response of a racing shoe. Cushioning should not automatically be taken to mean an exceptionally soft ride: perception varies between runners and with use.

Flexibility was measured at 18.8 N against an average of 15.5 N: the shoe took more force than average to bend in that test. Together with the curved sole, that resistance may appeal to someone who prefers a guided transition; runners who want a shoe that bends easily under the toes may find it less appealing.

Which runs suit it best

Its natural home is easy running, recovery outings and long runs on roads. The combination of foam, structure and weight suits sustained use at a comfortable effort. It can also work on a treadmill or smooth, compact paths, though it is not a replacement for a trail shoe on technical terrain.

As a rough guide, a pace of 4:45 to 5:45 per kilometre has been associated with this model, but it is not a limit on who can use it. Effort matters more: the same pace can be easy for one runner and demanding for another. For fast intervals or frequent pace changes, its weight and construction place less emphasis on agility.

During half-marathon or marathon training, it can cover the easy miles, provided the fit remains comfortable for the intended duration. A second pair is not essential for training; a lighter shoe only makes sense if a runner wants a different feel for faster sessions and the budget allows it.

Flyknit fit: sizing, width and arch

The Flyknit upper is a stretchy fabric that adapts to the foot and is paired with a partially integrated tongue. The result is a close fit, especially at the forefoot, with a padded collar and a heel held by the external structure. The laces allow pressure around the midfoot to be adjusted.

The toe box tapers towards the front and the shoe can feel slightly short. For a wide foot or someone between sizes, it is worth comparing the usual size with half a size up, wearing the socks intended for running. Check that the toes have room and that the heel does not slip while walking: sizing up for width can make the shoe too long overall.

Another defining feature is the pronounced inner arch. Some runners may notice pressure there or around the heel support. The fabric can give with use, but uncomfortable pressure from the first fitting is not a good reason to buy in the hope that it will disappear, particularly if the retailer limits returns after the shoes have been worn for a run.

The fabric on this third version is thicker than on its predecessor. That construction contributes to the secure feel, although it can feel warm on hot days. In the humid climate of the Valencian coast, ventilation and sock fit are practical factors worth bearing in mind.

Stability without rigid motion control

The Infinity Run 3 is best understood as a neutral shoe with stability features rather than a motion-control model. The support around the heel, the midsole sidewalls and the broad forefoot base help centre the foot without relying on traditional rigid correction.

The base narrows through the midfoot, so support does not feel identical under every part of the foot. For someone who needs specific midfoot support, the rear structure is not necessarily a substitute for a solution chosen for that need.

Neither stability nor cushioning means this shoe can be said to prevent injuries. If running causes pain or there is an injury related to foot mechanics, footwear should not be used as a treatment without assessment: a healthcare professional is responsible for evaluating the cause and support needs.

Outsole, grip and wear

The outsole uses rubber across its surface and is designed for roads. In the lab, forefoot traction measured 0.37 against an average of 0.53. The result is below that average in this particular test, but it cannot on its own predict grip on every surface, especially when the ground is wet or dirty.

Measured rubber thickness was 2.5 millimetres, against an average of 3.1. It is a useful indication of the amount of material, not a mileage forecast: wear also depends on the surface, the way the runner lands and conditions of use.

As the miles add up, it is worth looking at the outsole and the shoe as a whole. A heavily worn patch of rubber, visible deformation or a noticeably different feel between the two feet are reasons to inspect its condition. There is no universal replacement mileage that applies to every runner.

What changed from the Infinity Run 2

The third edition keeps a formula close to its predecessor: React foam, curved geometry and a support structure around the heel. The most visible change is the revised upper, with a sturdier tongue and thicker fabric. The heel pull tab has also been removed.

Someone already comfortable in version 2 will not find a radical change in the shoe’s concept. Even so, the fit of the fabric and the underfoot feel may be enough to make one preferable to the other. If both are available, the choice depends on fit as well as the actual difference in price.

Price and buying a previous-season model

The €160 launch price is a historical reference, not a guaranteed current price. Because the shoe was introduced in 2022, sizes, colours and costs can vary between retailers and remaining stock.

A discount is only worthwhile if the right size is available and the seller offers clear terms. When buying old stock or a second-hand pair, it is useful to inspect the condition of the rubber, foam and bonded areas, as well as confirm whether exchanges or returns are accepted. A shoe stored for years is not necessarily in the same condition as a newly manufactured pair, even if it still has its box.

For heavier runners or those covering high weekly mileage, there is no single threshold that rules the model out. The decision comes down to whether its cushioning and support remain comfortable for the intended use, while recognising that wear can differ from one runner to another. Its value lies in providing a stable platform for training, not in promising a fixed lifespan or a racing-shoe response.

How we put this review together: we have not tested these shoes. We wrote it by reading published lab tests, brand information and runners’ opinions.

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