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Air Zoom Structure 21

Nike Air Zoom Structure 21

Name: Nike Air Zoom Structure 21
Brand: Nike
Rating: 4.2 (14 reviews)

Daily trainer · Stability · Road · 10.4 oz · 10mm drop

Discontinued — we no longer see this shoe in stock. The Nike Air Zoom Structure 22 replaced it

How it ranks

The Nike Air Zoom Structure 21 rates in the 3rd percentile overall among daily trainers. Its strongest dimension is looks (74th percentile); its weakest is comfort (3rd). Of 9 runners who came to it from another shoe, 4 preferred it to what they ran before.

Based on 14 runner reviews.

Below average

55/100

Overall

Below average 55

Durability

Durability rating

We estimate how this shoe ranks by combining runner ratings, whether reviewers say they'd buy a shoe again, and direct comparisons to other shoes they've run in. We also consider related product-line performance and trusted external ratings. More review data helps narrow the likely rating range.

Better Shoes Rating

Very good (84/100)

Compared To Other Shoes

Scores better than 74% of shoes

Compared with all shoes

The shaded band shows the rating range we think is most likely.

Very good 84

Appearance

Appearance rating

Better Shoes Rating

Very good (85/100)

Compared To Other Shoes

Scores better than 73% of shoes

Compared with all shoes

The shaded band shows the rating range we think is most likely.

Very good 85

Cushioning

Cushioning rating

Better Shoes Rating

Good (74/100)

Compared To Other Shoes

Scores better than 49% of shoes

Compared with all shoes

The shaded band shows the rating range we think is most likely.

Good 74

Value

Value rating

Better Shoes Rating

Average (64/100)

Compared To Other Shoes

Scores better than 21% of shoes

Compared with all shoes

The shaded band shows the rating range we think is most likely.

Average 64

Comfort

Comfort rating

Better Shoes Rating

Below average (54/100)

Compared To Other Shoes

Scores better than 3% of shoes

Compared with all shoes

The shaded band shows the rating range we think is most likely.

Below average 54

What runners say

“The Structures have lasted beyond that average, but at $120 for a standard shoe, I would never pay full price for them.”

Ball Zach 4/5 Full review

“After about 8 months of use, I no longer have PF. Gone.”

3/5 Full review

“I had to swap the inner soles as the originals caused blisters on longer runs.”

jandre78 3/5 Full review

“It is comfortable and I do not have issues with my heel or any pain in the feet.”

3/5 Full review

“This shoe is very durable except for mine get worn down very quickly because I have a heel strike and run many miles.”

SteakSauce 5/5 Full review

“The only complaint about EVA material is it freezes in sub 32 temps.”

4/5 Full review

“The structures have a nice design and effective support for my overpronation.”

4/5 Full review

“The cushioning is a little firmer than I would like when running on hard concrete.”

4/5 Full review

“Heavy trainer that will put in the miles if you don't care about fashionability.”

4/5 Full review

“It is not very flexible, due to the dynamic stability feature in the midsole, but for those that wear support shoes, this is no surprise.”

4/5 Full review

Prefer this shoe over another

41% 7/17

Where to buy

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No offers available

Pros & Cons

Pros

Popular shoe among LetsRun.com readers.
Rated above average on cushioning.
Rated among the top 25% of shoes on durability.

Cons

Rated below average overall.
Rated among the bottom 10% of shoes on comfort.

Reader Ratings

14 reader ratings

5/5

4/5

3/5

2/5

1/5

Runner reviews

Write a review

Structure 21 Experience

Anonymous runner · Nov 21, 2018

4/5

Overall

This is my most commonly purchased shoe, it tends to fit my foot very well. There is just enough cushioning, although not an overwhelming amount. I felt as if there is more cushioning in the forefoot than the Structure 20. It is not very flexible, due to the dynamic stability feature in the midsole, but for those that wear support shoes, this is no surprise. They did a great job with the design of this shoe, with the color fade on the lateral side of the midsole, in my opinion. Overall, I am very happy with this iteration, Nike continues to make a great support shoe.

Comfort: 4/5
Cushioning: 4/5
Durability: 4/5
Appearance: 5/5
Value: 4/5

Needs a break in period

RoseCityTC · Oct 16, 2018

4/5

Overall

I found that after 50-100 miles these shoes really become comfortable and my go to trainer for easy runs.

Comfort: 4/5
Cushioning: 4/5
Durability: 5/5
Appearance: 4/5
Value: 5/5

Great shoe, but I'd never pay full price for it

Ball Zach · Oct 3, 2018

4/5

Overall

This shoe was my first foray into serious training in Nikes. Previous shoes were mostly Brooks Ravennas and Saucony Guides. I'm a bigger guy (6'3" 180 lbs) but still train pretty seriously (low 15's 5k, mid 25's 8k, 70ish half). What I find with being bigger is that I blow out the cushioning before the tread really begins to wear down. This can happen within 6-8 weeks, so I go through shoes pretty quick. The Structures have lasted beyond that average, but with how ridiculous shoe prices have gotten (around $120 for a standard shoe) I would never pay full price for them. It's just too much money to throw away. All in all, the Structures are a great shoe, but they're not $120 great.

Comfort: 4/5
Cushioning: 4/5
Durability: 4/5
Appearance: 5/5
Value: 3/5

Good stability shoe

jandre78 · Oct 3, 2018

3/5

Overall

Nice soft ride and good support. I had to swap the inner soles as the originals caused blisters on longer runs

Comfort: 3/5
Cushioning: 3/5
Durability: 3/5
Appearance: 3/5
Value: 3/5

Solid trainer

Anonymous runner · Oct 3, 2018

5/5

Overall

I've enjoyed returning to Nike's. The shoe has been responsive, light, and pretty durable. I just hate the price tag. Then again, I think all shoes are overpriced now as I used to be able to buy a nice pair of trainers for $70-80 10 years ago.

Comfort: 5/5
Cushioning: 5/5
Durability: 4/5
Appearance: 5/5
Value: 4/5