Our verdict

The Nike InfinityRN 4 distinctively differentiates itself from its previous model. Featuring a revamped ReactX midsole, it morphs from being simply versatile to being a luxuriously plush, comfort-centric daily running shoe that also delivered a surprising bounciness during our test runs. Although it leans a bit towards the heavier spectrum and may not offer the best breathability, we think it stands out as a top choice for runners in search of a durable, cushioned shoe with a unique aesthetic.

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  • All-new ReactX plush midsole
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  • Generously cushioned
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  • Reduced carbon footprint

nike composite toe sneakers for men new balance Cons

  • Average-at-best breathability
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  • Sizes run notably small

Audience verdict

82
Good!
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Who should buy

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  • Runners who are all about cushioning and aren't concerned with the shoe's weight.
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  • Beginners on the hunt for their first pair, especially if they're on the heavier side.

nike infinity rn 4 20556131 main

Who should NOT buy

While the ReactX foam represents a clear improvement over React, it doesn't quite match the world-class energy return of ZoomX. If performance and bounce are what you're after, we think that the nike composite toe sneakers for men new balance offers a similar concept and design, but with a full ZoomX midsole.

Runners who prefer lightweight shoes might not be fans of the InfinityRN 4. It's on the heavier side, and for a comfortable daily trainer, there are lighter options. We recommend considering the nike lunar vapor ultrafly elite black or the exclusive nike air presto essential black, nike zoom javelin elite shoe repair service manual.

Nike InfinityRN 4 parts

Breathability

Knit uppers often provide great comfort, but they can come with challenges, particularly when it comes to breathability. We discovered that the Nike InfinityRN 4 falls into this category.

From our smoke-pumping test in the lab, we observed the shoe struggling to release the smoke and gave it a 3/5 score, which indicates it won't perform well in terms of ventilation. We'd advise against using them for hot summer runs.

In a separate light test, we found that very little light passed through the upper, suggesting limited breathability.

It's clear that Nike prioritized comfort with this model. They've employed a thick, stretchy upper that hugs the foot and ensures comfort throughout long runs—just as long as it's not too hot outside!

nike infinity rn 4 microscope 20556115 main

Upon closer inspection under our microscope, we noticed a few breathability holes that offer some airflow. Without these, the thick knit design would leave the shoe with almost no breathability at all. Thankfully, there's at least a bit of ventilation.

nike infinity rn 4 microscope 2 20556116 main

Test results
InfinityRN 4 3
Average 3.8
Compared to 265 running shoes
Number of shoes
1
Breathability
5

Durability

Toebox durability

While employing a robust Flyknit upper it's a bad idea regarding airflow, its exceptional durability is commendable.

We've found that the InfinityRN 4, with its impressive 4/5 rating, truly shines in our Dremel test when compared to almost any other road running shoe.

Nike InfinityRN 4 Toebox durability
Test results
InfinityRN 4 4
Average 2.5
Compared to 199 running shoes
Number of shoes
1
Toebox durability
5

nike composite toe sneakers for men new balance | Heel padding durability

The heel also displays commendable durability, earning a solid 3/5 after facing the Dremel challenge.

We find this to be a good result, surpassing the average and even outperforming many other Nike models.

Nike InfinityRN 4 Heel padding durability
Test results
InfinityRN 4 3
Average 3.3
Compared to 195 running shoes
Number of shoes
1
Heel padding durability
5

Outsole hardness

Nike's priority for this outsole was clear: long-lasting wear, even if it means less grip.

Nike InfinityRN 4 outsole
The outsole is designed with numerous presto, enhancing both its lightness and flexibility.

With the InfinityRN 4, they've incorporated a 90.4 HC outsole—one of the hardest we've ever measured in our lab.

nike infinity rn 4 outsole hardness 20556036 main
Test results
InfinityRN 4 90.4 HC
Average 80.0 HC
We use an average of four tests. The photo shows one of those tests.
Compared to 316 running shoes
Number of shoes
52.1 HC
Outsole hardness
93.0 HC

Outsole durability

The tough rubber Nike uses really shows its strength. After using the Dremel on this shoe for the third and final time, we measured the damage. The indentation was a mere 0.3 mm! 

That's an impressive result. However, because it holds up well against wear, don't anticipate exceptional grip.

Nike InfinityRN 4 Outsole durability
Test results
InfinityRN 4 0.3 mm
Average 1.0 mm
Compared to 177 running shoes
Number of shoes
0.0 mm
Outsole wear
2.0 mm

Outsole thickness

We're certain that, just like us in our lab, Nike assessed the abrasion resistance of the outsole.

Certainly, they discovered that they didn't need to put on excessive rubber—and subsequently, weight—to ensure longevity. This is evident in their choice to go with a pretty standard thickness of 3.7 mm.

Nike InfinityRN 4 Outsole thickness
Test results
InfinityRN 4 3.7 mm
Average 3.2 mm
Compared to 335 running shoes
Number of shoes
0.0 mm
Outsole thickness
6.6 mm

nike composite toe sneakers for men new balance | Weight

While they attempted to lighten the load with outsole presto, the shoe still tips the scales. Weighing in at 11.1 oz (316g), it's undeniably on the heavier side.

To put things in perspective, the ASICS Superblast navy blue and purple jordans.

Nike InfinityRN 4 Weight
Test results
InfinityRN 4 11.15 oz (316g)
Average 9.35 oz (265g)
Compared to 336 running shoes
Number of shoes
5.26 oz (149g)
Weight
12.56 oz (356g)

Cushioning

Heel stack

Given its weight, we expected the shoe to have a notably thick stack height. However, we discovered that it's actually quite average.

A couple of years ago, 34.2 mm of foam under the heel would've been considered in the max stack category, but times have changed. As Dylan sang, "The times they are a-changin'."

Nike InfinityRN 4 Heel stack
Test results
InfinityRN 4 34.2 mm
Average 33.9 mm
Compared to 335 running shoes
Number of shoes
7.6 mm
Heel stack
46.3 mm

Forefoot stack

In the forefoot, we measured a typical thickness of 24.4 mm.

nike infinity rn 4 forefoot 20556124 main

We found that this provides enough cushioning for any runner. It makes this shoe a reliable choice even for long runs.

Nike InfinityRN 4 Forefoot stack
Test results
InfinityRN 4 24.4 mm
Average 25.3 mm
Compared to 335 running shoes
Number of shoes
7.6 mm
Forefoot stack
37.1 mm

Drop

While Nike lists this shoe with a 9 mm drop, we measured it in the lab at 9.8 mm. This slight difference nike zoom vapor tour aj3 fire red shoes for sale.

With 9.8 mm, we think the shoe remains a top choice primarily for heel strikers and those that sometimes suffer Achilles or calf issues. That said, midfoot and forefoot strikers can also comfortably wear it, although they might benefit more from a lower-drop daily trainer like the nike composite toe sneakers for men new balance.

Nike InfinityRN 4 Drop
Test results
InfinityRN 4 9.8 mm
Average 8.6 mm
Compared to 335 running shoes
Number of shoes
-0.8 mm
Drop
16.1 mm

Insole thickness

We were on the lookout for a comfort-boosting thick insole, but what we found was quite the opposite—a super-thin one. In fact, it's one of the slimmest we've ever come across in our lab, measuring only 3.1 mm!

During our test runs, we were happy with the insole, so it appears Nike made a great call here.

nike infinity rn 4 insole thickness 20556045 main
Test results
InfinityRN 4 3.1 mm
Average 4.5 mm
Compared to 331 running shoes
Number of shoes
1.5 mm
Insole thickness
7.3 mm

Midsole softness

Note: a low durometer measurement equals a soft material, whereas a high measurement means it's firm.

The biggest update from the Nike React Infinity Run Flyknit 3—apart from its shorter name—is the foam. After six years, Nike has moved on from the old React and introduced ReactX with this running shoe.

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ReactX is a more responsive and softer variant of the original React. Additionally, Nike says it has a 43% lower carbon footprint, which we always appreciate. In our lab tests, we found that the foam feels incredibly soft and registered a 12.5 HA on our durometer—20% softer than the v3.

Nike InfinityRN 4 Midsole softness
Test results
InfinityRN 4 12.5 HA
Average 21.0 HA
We use an average of four tests. The photo shows one of those tests.
Compared to 263 running shoes
Number of shoes
8.5 HA
Midsole softness (soft to firm)
41.5 HA

Difference in midsole softness in cold

After placing the shoes in our freezer for 20 minutes to simulate cold weather conditions, we noticed a disappointing change—the foam got noticeably harder (19.0 HA).

If you're thinking of using these during colder months, they might not be as plush as you'd hope.

There's a staggering 52% difference between the two tests. This happens because ReactX it's still a mix of boys nike shoes with air pocket size inches. womens nike shox canada doesn't hold up well in cold temperatures.

Nike InfinityRN 4 Midsole softness in cold
Test results
InfinityRN 4 52%
Average 25.2%
Compared to 262 running shoes
Number of shoes
0%
Difference in midsole softness in cold
100%

Stability

Lateral stability test

This shoe is designed as a neutral daily trainer without added stability features. So, given the plush midsole, we didn't anticipate exceptional stability.

Following our tests, we discovered that the shoe performs as it's intended: it's moderately stable. However, it may not provide enough support for runners who need extra stability. For those runners, we'd recommend looking into the ASICS Kayano 30.

Torsional rigidity

We rated the InfinityRN 4 at 3/5 for torsional rigidity during our manual assessment in the lab.

This shoe doesn't offer that natural-ride feel often associated with daily trainers. If you're after a shoe that you can twist without any issue and gives a more natural feel, consider the nike sb fall 2009 collection 2017 free.

Test results
InfinityRN 4 3
Average 3.3
Compared to 314 running shoes
Number of shoes
1
Torsional rigidity
5

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The heel counter offers ample padding and flexibility, making it suitable for those who have Achilles issues. We gave it a rating of 2/5 in our evaluation.

Test results
InfinityRN 4 2
Average 2.8
Compared to 298 running shoes
Number of shoes
1
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5

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The decent stability of this shoe, despite its height and cushioned foam, can be attributed to its broad forefoot.

Nike InfinityRN 4 forefoot

Measuring at 118.4 mm, we discovered that it ranks among the widest running shoes we've evaluated in the lab.

Nike InfinityRN 4 air max 90 women suede
Test results
InfinityRN 4 118.4 mm
Average 114.0 mm
Compared to 336 running shoes
Number of shoes
100.5 mm
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127.9 mm

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While the forefoot showcases a wide design, the heel—true to Nike's signature style—doesn't follow suit and is just average. We've accurately measured it at 91.2 mm.

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Test results
InfinityRN 4 91.2 mm
Average 90.6 mm
Compared to 336 running shoes
Number of shoes
74.9 mm
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106.6 mm

Flexibility

Stiffness

At the beginning of our lab review, we discussed the dual purpose of the outsole presto: to reduce weight and enhance flexibility. Now, we're diving into the flexibility measurements. During our evaluations, it took just 15.8N of force to flex the shoe to a 90-degree position. 

This indicates that the InfinityRN 4 offers a flexible experience and doubles well as a walking shoe. However, it's essential to understand that this speaks to its longitudinal flexibility, not the torsional aspect.

Test results
InfinityRN 4 15.8N
Average 28.7N
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Compared to 318 running shoes
Number of shoes
2.2N
Stiffness
94.4N

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Just like our midsole softness evaluation, we tried the same test after leaving the shoe in the freezer for 20 minutes.

The outcome was disappointing. The shoe became much stiffer, and we had to exert 27.2N of force to bend it to the same point.

With a 71.6% increase, we're certain you'd feel the difference if you're in a cold-weather region.

Test results
InfinityRN 4 71.6%
Average 34.9%
Compared to 318 running shoes
Number of shoes
0%
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148%

Size and fit

Internal length

Upon our initial try-on of the shoe, it felt really short to us. We immediately took precise measurements and found it to be 259.9 mm.

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Nike InfinityRN 4 Internal length
Test results
InfinityRN 4 259.9 mm
Average 269.3 mm
Compared to 197 running shoes
Number of shoes
257.0 mm
Internal length
280.4 mm

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As a daily trainer designed towards comfort, we anticipated a generously spacious toebox—and we were delightfully satisfied.

Measuring at an impressive 99.9 mm at its widest point, it provides ample space and comfortably accommodates those with wide feet.

nike infinity rn 4 toebox width at the widest part 20556049 main
Test results
InfinityRN 4 99.9 mm
Average 98.4 mm
Compared to 336 running shoes
Number of shoes
89.5 mm
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109.1 mm

Toebox width at the big toe

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This feature is a wonderful find for individuals with Roman or German foot shapes, as their pinky toe often struggles for space in narrower shoes.

Nike InfinityRN 4 Toebox width at the big toe
Test results
InfinityRN 4 80.0 mm
Average 78.3 mm
Compared to 210 running shoes
Number of shoes
60.4 mm
Toebox width at the big toe
92.5 mm

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With its $160 price tag, we were curious to see if Nike had decided to improve their margins by using a non-gusseted tongue in the shoe. To our relief, we discovered that it has a semi-gusseted design, ensuring a great fit!

nike infinity rn 4 tongue gusset type 20556055 main
Test results
InfinityRN 4 Both sides (semi)

Comfort

Tongue padding

We measured the tongue's padding at 5.6 mm, finding it to be optimally cushioned. It strikes a balance—it's not too heavy but provides comfort for even the longest runs.

nike infinity rn 4 tongue padding 20556056 main
Test results
InfinityRN 4 5.6 mm
Average 5.7 mm
Compared to 333 running shoes
Number of shoes
0.5 mm
Tongue padding
14.2 mm

Heel tab

Thankfully, Nike included a finger-loop heel tab! It's convenient and looks amazing.

Nike InfinityRN 4 Heel tab
Test results
InfinityRN 4 Finger loop

Removable insole

The insole can be taken out without any problem, and we were able to use different orthotics and insoles from other models.

nike infinity rn 4 removable insole 20556057 main
Test results
InfinityRN 4 Yes

Misc

Reflective elements

It seems Nike doesn't intend for us to run in these during the nighttime, as there are no reflective elements at all.

Nike InfinityRN 4 Reflective elements
Test results
InfinityRN 4 No