Nike Dunk Low Racer Blue WhiteDD1391-401 | Nike Dunk Sky Hi 2 review

The Nike Dunk Sky Hi 2 gets our seal of approval for:

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

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 Invincible 3 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 sb dunk low brown gum or the New Balance Fresh Foam X 1080 v12, both of which deliver similar features in a lighter package.

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'."

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

While Nike lists this shoe with a 9 mm drop, we measured it in the lab at 9.8 mm. This slight difference is within an acceptable range.

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 Dunk Low Wmns Black Paisley.

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.

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 TPE and EVA. nike w air max 270 react se white doesn't hold up well in cold temperatures.

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.

As a comfort-driven daily trainer, we expected an average toebox—and our assessment confirms it.

According to our research, the toebox measured 95.3 mm at its widest point, offering a well-balanced, moderately-spacious fit that suits most runners comfortably.

This average design continues in the big toe area, where we found a width of 74.1 mm.

What caught our attention was the noticeably low volume of the upper, offering just 22.4 mm of vertical space in the toe area. 

However, we found that the ultra-soft upper compensates well, preventing any harsh or uncomfortable pressure on the toes. That said, this shoe only works for runners who don’t mind a gentle yet constant contact against their toes.

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 Nike Air Jordan 1 Retro High OG Chicago Lost And Found UK7.5 TD.

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 Saucony Ride 16.

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.

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

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

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.

At the beginning of our lab review, we discussed the dual purpose of the outsole cutouts: to reduce weight and enhance flexibility. Now, we're diving into the flexibility measurements. During our evaluations, it took 14.8N of force to flex the shoe to a 30-degree position. 

To be honest, we expected a bit more from the outsole cutouts, as they only brought the InfinityRN 4 to an average stiffness level, and it would’ve been great to see even less rigidity for a smoother feel.

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

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Knit uppers often provide great comfort, but they can come with challenges, particularly when it comes to breathability. We discovered that the Nike Dunk Sky Hi 2 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!

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.

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.

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

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

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.

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.

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

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.

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!

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

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