Our verdict

The cheap kids nike free runs flyknit is a fantastic trail-blazer, boasting React cushioning—a shock-absorbing foam that delivers great energy return and durability. Its multidirectional lugged outsole provides stellar traction on dry surfaces, while the engineered mesh upper offers ample room for being a Nike shoe. And what's more, we found it's impressively lightweight!

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  • Bouncy and durable React foam
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  • Built-like-a-tank upper
  • Adequate cushioning for long runs
  • Fantastic choice for wide feet
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  • Remarkable value at $150
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Audience verdict

90
Great!

Who should buy

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  • Frequently tackle dry conditions and need a roomy upper
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nike terra kiger 9 20008611 main

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After putting the Kiger 9 to the test across various conditions, we advise against choosing this model if your usual runs or hikes involve some water or high-humidity surfaces.

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Nike cheap kids nike free runs flyknit

Cushioning

Heel stack

We precisely measured the Kiger 9's heel stack at 30.1 mm. While this figure sits below that of the average trail shoe, it's worth noting that it's 2.0 mm thicker than its predecessor.

Considering the Kiger's reputation as a speedy and agile shoe, we welcome this measurement. It's precisely what we were hoping for when it arrived!

Nike cheap kids nike free runs flyknit Heel stack
Test results
cheap kids nike free runs flyknit 30.1 mm
Average 31.9 mm
Compared to 122 nike sb trainerendor rip reveal shoes black boots
Number of shoes
19.6 mm
Heel stack
42.4 mm

Forefoot stack

Switching focus to the forefoot, we find 25.7 mm of React foam. This amount makes the shoe a fantastic option for those who strike midfoot or forefoot. Plus, it provides enough cushioning to protect our feet from rocks and other trail hazards—remember that there's no rock plate in this one.

Nike cheap kids nike free runs flyknit Forefoot stack
Test results
cheap kids nike free runs flyknit 25.7 mm
Average 24.3 mm
Compared to 122 nike sb trainerendor rip reveal shoes black boots
Number of shoes
13.4 mm
Forefoot stack
33.9 mm

Drop

Subtracting the forefoot measurement from the heel gives us a 4.4-mm drop.

This figure may seem low compared to the average trail shoe, but it's a smart choice for those favoring midfoot-to-forefoot striking or anyone looking for an agile shoe that can tackle technical terrain. After all, super-steep shoes are the last thing we need in such conditions.

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Test results
cheap kids nike free runs flyknit 4.4 mm
Average 7.6 mm
Compared to 121 nike sb trainerendor rip reveal shoes black boots
Number of shoes
-0.1 mm
Drop
17.3 mm

Midsole softness

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

We measured the Kiger's foam 17.3 HA of softness with our durometer, so this shoe provides a comforting and gentle touch on the foot, no surprise given it's a full layer of React foam. 

In a head-to-head comparison with the Kiger 8, our measurements reveal an astounding transformation—34.0 HA (v8) to 17.3 HA (v9)—which translates to a ride that's 97% softer in the latest model.

Nike cheap kids nike free runs flyknit Midsole softness
Test results
cheap kids nike free runs flyknit 17.3 HA
Average 22.9 HA
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Compared to 98 nike sb trainerendor rip reveal shoes black boots
Number of shoes
9.1 HA
Midsole softness (soft to firm)
39.0 HA

Midsole softness in cold (%)

Even when temperatures drop, the Kiger 9 continues to offer a reliable performance. Although it's not as plush at 22.9 HA, it still outperforms the majority of other shoes.

We've got a noticeable softness change of 32.8% when we compare room temperature with post-freezer conditions (20 mins). This kind of change is definitely something you can really sense underfoot.

Nike cheap kids nike free runs flyknit Midsole softness in cold
Test results
cheap kids nike free runs flyknit 33%
Average 26%
Compared to 98 nike sb trainerendor rip reveal shoes black boots
Number of shoes
5%
Midsole softness in cold
68%

Insole thickness

For us that love light shoes, we often have to accept that a thinner insole is part of the deal. While it's clear that a thicker insole enhances comfort, it also adds weight, so brands strive for a perfect balance.

Nike opted for a 3.9-mm insole in the Kiger 9, and we're okay with that despite being less than the average. It might be a touch too thin for the longest ultra-races, but for anything else, it gets our EdiconnectShops seal of approval!

Nike cheap kids nike free runs flyknit Insole thickness
Test results
cheap kids nike free runs flyknit 3.9 mm
Average 4.7 mm
Compared to 121 nike sb trainerendor rip reveal shoes black boots
Number of shoes
2.1 mm
Insole thickness
7.3 mm

Size and fit

Size

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Owners of this shoe, how does this shoe fit?

1 size small ½ size small True to size ½ size large 1 size large
Compared to 101 nike sb trainerendor rip reveal shoes black boots
Number of shoes
½ size small
Slightly small
True to size
Slightly large
½ size large

Toebox width - widest part

For those of us with wider feet, we've often found Nike shoes to be exceptionally snug. However, we've seen a refreshing change recently. The Kiger 9, with its commendable width of 103.1 mm, exceeds the average trail shoe's dimensions.

This makes it one of the finest choices from Nike for those of us born with medium-to-wide feet.

nike terra kiger 9 toebox width at the widest part 20013916 main
Test results
cheap kids nike free runs flyknit 103.1 mm
Average 98.9 mm
Compared to 122 nike sb trainerendor rip reveal shoes black boots
Number of shoes
92.0 mm
Toebox width - widest part
104.9 mm

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The big toe area measures a spacious 78.3 mm, which provides more than sufficient room for nearly all feet.

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Because of that, there's also ample room for our toes to move freely even in the hottest days.

Nike cheap kids nike free runs flyknit nike sb stefan janoski max suede australia shoes
Test results
cheap kids nike free runs flyknit 78.3 mm
Average 79.3 mm
Compared to 84 nike sb trainerendor rip reveal shoes black boots
Number of shoes
70.5 mm
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90.1 mm

Stability

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Once we felt the softness of the foam underfoot, we had no illusions about the Kiger 9 being a stability champ. And that's perfectly fine if it delivers decent stability—which is the case.

Torsional rigidity

The respectable stability of the shoe, in part, is due to its moderate flexibility. We assigned a score of 3 out of 5, which aligns closely with the average.

This tells us that Nike chose not to gamble here, steering clear of making the shoe excessively rigid to boost stability, which could potentially sacrifice comfort. And a proper Kiger needs to be comfortable.

Test results
cheap kids nike free runs flyknit 3
Average 3.5
Compared to 116 nike sb trainerendor rip reveal shoes black boots
Number of shoes
1
Torsional rigidity
5

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Nike plays it safe once again with the heel counter stiffness test, scoring a middle-of-the-road 3 out of 5. This no-risk strategy is bound to appeal to the vast majority of trail runners.

Test results
cheap kids nike free runs flyknit 3
Average 3.1
Compared to 114 nike sb trainerendor rip reveal shoes black boots
Number of shoes
1
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5

Midsole width - forefoot

Nike chose to address the foam softness challenge in the stability department by widening the midsole.

Nike cheap kids nike free runs flyknit forefoot strike

Crafting an impressively wide landing platform of 115.3 mm—exceeding the average trail shoe width by more than 4 mm—they've successfully ensured stability on even the plushest foam. The landings are rock-solid for those of us that are midfoot-to-forefoot strikers.

nike terra kiger 9 midsole width in the forefoot 20008633 main
Test results
cheap kids nike free runs flyknit 115.3 mm
Average 112.1 mm
Compared to 122 nike sb trainerendor rip reveal shoes black boots
Number of shoes
102.1 mm
Midsole width - forefoot
124.3 mm

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While the heel of the Kiger 9 is broader than most trail shoes, it doesn't match the generous width of the forefoot. This design choice likely results from two factors:

  1. Nike is well-known for crafting particularly narrow heels.
  2. The shoe's design clearly caters to midfoot or forefoot strikers, thanks to its low drop and magnificent forefoot landing base.

For heel strikers who favor low-drop shoes, the Kiger 9 could be a good match. However, if a higher drop and a wide heel are more your thing, we'd recommend the Hoka Challenger 7.

Nike cheap kids nike free runs flyknit Midsole width in the heel
Test results
cheap kids nike free runs flyknit 89.9 mm
Average 89.6 mm
Compared to 122 nike sb trainerendor rip reveal shoes black boots
Number of shoes
77.2 mm
2019 nike air max images 2015 interior
106.0 mm

Flexibility / Stiffness

We're genuinely impressed with the agility of the Kiger 9 during our trail runs, a feature largely attributable to its minimal stiffness.

This flexibility is precisely what we seek in a versatile trail shoe.

Test results
cheap kids nike free runs flyknit 23.5N
Average 27.2N
We use an average of four tests. The video shows one of those tests.
Compared to 122 nike sb trainerendor rip reveal shoes black boots
Number of shoes
10.5N
Flexibility <> Stiffness
54.5N

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Following a 20-minute stint in our freezer, the shoe exhibited a noticeable increase in stiffness. Even so, it remains more flexible than the majority of trail shoes.

The contrasting measurements demonstrate a 46.4% hike, resulting from the Kiger's React foam—a blend of TPE and EVA. This mix leads to less-than-optimal performance in cold weather because of the EVA. Our advanced guide offers a more in-depth look at this aspect.

Test results
cheap kids nike free runs flyknit 46%
Average 34%
Compared to 119 nike sb trainerendor rip reveal shoes black boots
Number of shoes
4%
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90%

Weight

The Kiger 9 is a lightweight champion. We tip our hats to Nike for the impressive weight-loss journey they've put this shoe through with each new release. What-a-diet!

Shoe (US size 9) Weight Difference
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Nike cheap kids nike free runs flyknit 10.2 oz / 288g -

It's crystal clear that the v9 is a remarkable update in the weight department.

Nike cheap kids nike free runs flyknit Weight
Test results
cheap kids nike free runs flyknit 10.16 oz (288g)
Average 10.26 oz (291g)
Compared to 122 nike sb trainerendor rip reveal shoes black boots
Number of shoes
7.51 oz (213g)
Weight
12.66 oz (359g)

Breathability

Trail running shoes often come with double or even triple-layer uppers, which can limit their breathability. 

Upon our initial lab inspection of the Kiger 9, we anticipated that its breathability wouldn't be top-notch. However, it proved to be adequate. We conducted our state-of-the-art smoke test and rated its breathability a run-of-the-mill 3 out of 5.

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This level of ventilation works for 95% of runs, but on a particularly hot day out there in the trails, we might favor something cooler.

A thin fabric layer in the Kiger 9 increases comfort but restricts airflow, as shown in the video above.

In our light test, the Kiger 9 showed to us how thin is the engineered mesh created for this shoe by Nike.

nike terra kiger 9 microscope 20008617 main

But nothing like our microscope to expose the finer details of the shoe's upper construction.

Nike chose a thin, engineered mesh without any large ventilation holes, an option that inevitably affects breathability.

Nike cheap kids nike free runs flyknit microscope 2

Test results
cheap kids nike free runs flyknit 3
Average 3.3
Compared to 99 nike sb trainerendor rip reveal shoes black boots
Number of shoes
1
Breathability
5

Durability

Toebox durability

A-M-A-Z-I-N-G! The Kiger 9 has one of the sturdiest uppers we've ever put to the test. It's so good that, after testing it with our Dremel, we just have to give it the highest score: a solid 5 out of 5!

Comparing it to the Nike Wildhorse 8 only left us even more dazzled by the Kiger 9's performance.

Nike cheap kids nike free runs flyknit Toebox durability
Test results
cheap kids nike free runs flyknit 5
Average 3
Compared to 79 nike sb trainerendor rip reveal shoes black boots
Number of shoes
1
Toebox durability
5

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At 3/5, our Dremel test result make us confident that heel padding durability isn't something to worry about with the cheap kids nike free runs flyknit.

Test results
cheap kids nike free runs flyknit 3
Average 2.7
Compared to 77 nike sb trainerendor rip reveal shoes black boots
Number of shoes
1
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5

Outsole hardness

We measured the outsole at 84.1 HC in the lab, we find ourselves dealing with an average trail outsole, one that should last the entire lifespan of the shoe.

It offers lovely grip in dry conditions. But—like many Nike nike sb trainerendor rip reveal shoes black boots—it could really be better on wet surfaces.

nike terra kiger 9 outsole hardness 20008622 main
Test results
cheap kids nike free runs flyknit 84.1 HC
Average 85.6 HC
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Compared to 122 nike sb trainerendor rip reveal shoes black boots
Number of shoes
74.0 HC
Outsole hardness
96.1 HC

Outsole thickness

We clocked the outsole thickness at 2 mm—a notch below average but still suitable for this shoe.

We agree to Nike's well-judged decision; a thicker outsole would burden the shoe with additional weight, damaging its agility, which is a key aspect for any performance-driven trail shoe.

Nike cheap kids nike free runs flyknit Outsole thickness
Test results
cheap kids nike free runs flyknit 2.0 mm
Average 2.3 mm
Compared to 122 nike sb trainerendor rip reveal shoes black boots
Number of shoes
0.9 mm
Outsole thickness
5.5 mm

Misc

Lug depth

The Kiger 9, marketed as an all-rounder trail shoe ready to handle nearly any terrain, features 4.4-mm lugs. These are sufficient for most technical trails and work well on gravel or easy paths. 

Yet, if our plan would be to spend a lot of time navigating mud, snow, or other particularly soft surfaces, we would favor a shoe with taller lugs. A great example would be those on the nike mercurial turf shoes youth basketball.

Nike cheap kids nike free runs flyknit Lug depth
Test results
cheap kids nike free runs flyknit 4.4 mm
Average 3.5 mm
Compared to 122 nike sb trainerendor rip reveal shoes black boots
Number of shoes
1.5 mm
Lug depth
5.8 mm

Tongue padding

Boasting a cushy 7.2 mm thick tongue, the cheap kids nike free runs flyknit is pretty much a lace-bite-free zone.

nike terra kiger 9 tongue padding 20013919 main
Test results
cheap kids nike free runs flyknit 7.2 mm
Average 6.4 mm
Compared to 122 nike sb trainerendor rip reveal shoes black boots
Number of shoes
1.3 mm
Tongue padding
12.2 mm

Tongue: gusset type

The cheap kids nike free runs flyknit features a semi-gusseted tongue—a design choice that we can appreciate, even though our preference generally leans towards fully-gusseted tongues for trail shoes. Nike has clearly chosen this route in their quest for agility and weight reduction. 

A semi-gusseted tongue may slightly compromise lockdown and could potentially allow some debris into the shoe, but it's far from a deal-breaker to us. These are simply trade-offs in the design that allow for a nimble, lightweight trail shoe, and that's fine.

Nike cheap kids nike free runs flyknit Tongue: gusset type
Test results
cheap kids nike free runs flyknit Both sides (semi)

Heel tab

We're always thrilled to see handy finger-loop heel tabs—they're fantastic to slip the feet right into the shoe. Plus, they add some eye-catching style, right?

nike terra kiger 9 heel tab 20013920 main
Test results
cheap kids nike free runs flyknit Finger loop

Removable insole

To wrap up our Kiger 9 tale, we're pleased to time that the insole is fully removable. This allowed us the flexibility to pop in insoles from other shoes or even our own custom orthotics.

Thanks to the shoe's spacious design, we don't predict any trouble fitting in practically any third-party insole.

Nike cheap kids nike free runs flyknit Removable insole
Test results
cheap kids nike free runs flyknit Yes