adidas Women's Ultraboost 21 Running Shoe

4.5 4.5 out of 5 stars 4,896 ratings

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Size Chart
US Footwear
Brand SizeUK SizeEuropeJapanHeel to toe (in)
53.5362208.7
5.5436.672258.9
64.537.332309
6.55382359.2
75.538.672409.4
7.5639.332459.5
86.5402509.7
8.5740.672559.8
97.541.3326010
9.584226510.2
108.542.6727010.4
10.5943.3327510.5
119.54428010.7
11.51044.6728510.9
1210.545.3329011
12.5114629511.2
1311.546.6730011.3
13.51247.3330511.5
1412.54831011.7
14.51348.6731511.9
1513.549.3332012
15.5145032512.2
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Product details

  • Product Dimensions ‏ : ‎ 11 x 4 x 7 inches; 9.8 ounces
  • Item model number ‏ : ‎ KYQ94
  • Department ‏ : ‎ womens
  • Date First Available ‏ : ‎ June 1, 2021
  • Manufacturer ‏ : ‎ adidas
  • ASIN ‏ : ‎ B087F8SJ7G
  • Customer Reviews:
    4.5 4.5 out of 5 stars 4,896 ratings

Product Description

These women's Ultraboost shoes are designed to give runners the comfort and responsiveness they need. An adidas Primeknit upper is stretchy and has a sock-like fit. A Linear Energy Push system increases forefoot and midfoot stiffness. The S-curve heel eliminates slip, and the signature Boost cushioning returns energy to your stride.

Customer reviews

4.5 out of 5 stars
4.5 out of 5
4,896 global ratings

Customers say

Customers like the appearance and support of the shoes. For example, they say they look sharp and the laces are decorative. Customers appreciate the value, comfort, and quality of the product. That said, some complain about the ease of use. Opinions are mixed on versatility and fit.

AI-generated from the text of customer reviews

192 customers mention149 positive43 negative

Customers like the comfort of the shoes. They say it hugs their feet, has a lot of cushioning, and does not hurt their feet after working long hours. Some customers also mention that the shoes breathe really well.

"Great running shoes! Very comfortable" Read more

"Takes some time to adjust lol but definitely good comfort I work at an airport and stand on my feet all day , my heels were killing me for sure this..." Read more

"I work 12 hours as a nurse. This shoes is so comfortable. Does not hurt my feet after working long hours." Read more

"...The shoe hugs the feet, which I am not necessarily a fan of. The laces are mostly decorative, basically...." Read more

90 customers mention72 positive18 negative

Customers like the quality of the shoes. They say they're well made, have good form, and hold up well. Some mention that the shoes are very structured and amazing for running and walking.

"Great running shoes! Very comfortable" Read more

"...make sure to not wear any thick socks in this shoe for they have a good form for sure but they can be tight and order half size up for sure" Read more

"These shoes provide great support for running and walking. The heel is a little ridiculously large and looks funny when worn with shorts...." Read more

"Good made" Read more

59 customers mention48 positive11 negative

Customers like the appearance of the shoes. For example, they mention they love the look, the lace is mostly decorative, and they look sharp. Some say the shoes are comfortable and look and feel like a glove.

"...The laces are mostly decorative, basically. I love the rose color I chose and get compliments on them...." Read more

"I love the style of shoe and I also love that on Amazon’s website it is 10 times cheaper. This is a great option for every day use or walking...." Read more

"...Are the legit ultra boosts from Addidas. Love the colors and style...." Read more

"...Love the look, but I’m returning them and bought another brand...." Read more

26 customers mention23 positive3 negative

Customers like the support provided by the shoes. They mention that it offers great toe-hill-ankle support, and provides a lot of support to the arches. Some say that the shoes are comfortable and easy to put on.

"...heel; but the work-out itself is fine in these shoes, as they provide lots of support and shock absorbency." Read more

"These are crazy comfortable and have good support. The foam sole protects my knees and heels from my heavy foot strikes." Read more

"...They are less flexible. They still offer great support, but I prefer the shoes that are mostly (or all) the mesh material on the upper around the..." Read more

"Great toe-hill-ankle support...." Read more

21 customers mention18 positive3 negative

Customers like the value of the shoes. They say the Pureboost line is hard to beat for the price, and is a great buy.

"...Thanks, Adidas, for making such a kickass, reasonably priced shoe. You have a customer for life if you never stop making Ultraboosts." Read more

"New in box, great price" Read more

"I love this shoes and they're worth every penny, the only thing it's that I wish I would have listened to the reviews saying that they run small...." Read more

"...These are both durable and affordable...." Read more

112 customers mention53 positive59 negative

Customers are mixed about the fit of the shoes. Some mention that the fit is heaven with wider feet, the added arch support and their insoles fit perfect in the shoes, and the foam sole protects their knees and heels from heavy foot strikes. However, others say that the fitting is tight, the heel is ridiculously large, and they feel big and bulky just out of the box.

"...socks in this shoe for they have a good form for sure but they can be tight and order half size up for sure" Read more

"Had to size up, but love the fit." Read more

"...The heel is a little ridiculously large and looks funny when worn with shorts...." Read more

"These are crazy comfortable and have good support. The foam sole protects my knees and heels from my heavy foot strikes." Read more

23 customers mention10 positive13 negative

Customers are mixed about the versatility of the shoes. Some mention that it offers great support and reduces fatigue from a long day on their feet, while others say that it's useless for running, working out, and exercising.

"...They aren't the best for working out as far as sitting for stretches because of the large, protruding heel; but the work-out itself is fine in..." Read more

"...Still love this shoe, and it offers great support and reduces fatigue from a long day on my feet...." Read more

"...Totally not functional for exercising, I practically trip over these shoes." Read more

"...these because of reviews I have read and that they are good for running with soreness in the balls of the feet. Well, it didnt help...." Read more

22 customers mention6 positive16 negative

Customers find the shoes difficult to use. They mention that the tongue is attached so it's not the easiest to slide on. Some say that the laces are very short and hard to tie. They also say that it takes some time to adjust and that the shoes are bulky and take a lot longer to break in.

"Takes some time to adjust lol but definitely good comfort I work at an airport and stand on my feet all day , my heels were killing me for sure this..." Read more

"...into this small opening into a sock-like fit, then there's no way to tighten the laces...." Read more

"...speed was 5:50 but doesn't feel very safe... As I said, they're good for easy days" Read more

"...Consequently, I had a hell of a time getting them on. Once I did, they were too short...." Read more

Too tight in the instep
3 Stars
Too tight in the instep
I used it to take my dog ​​out for 30 minutes and the top of my foot hurt and my heel was too tight. It was unbearable, I had to return them. Maybe I'll try ordering a half size up.
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Top reviews from the United States

Reviewed in the United States on February 19, 2024
Size: 9.5Color: Black/Black/GreyVerified Purchase
Reviewed in the United States on February 23, 2024
Size: 11Color: Orchid Tint/Orchid Tint/Violet ToneVerified Purchase
Reviewed in the United States on May 15, 2023
Size: 10Color: Black/Black/BlackVerified Purchase
5 people found this helpful
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Reviewed in the United States on February 15, 2024
Size: 6.5Color: White/White/GreyVerified Purchase
Reviewed in the United States on April 3, 2023
Size: 6Color: Ash Pearl/White/Halo IvoryVerified Purchase
Reviewed in the United States on March 9, 2024
Size: 6.5Color: White/Black/Solar YellowVerified Purchase
Reviewed in the United States on March 7, 2024
Size: 9Color: Ice Purple/White/Rose ToneVerified Purchase
Reviewed in the United States on January 25, 2024
Size: 6Color: Black/Black/GreyVerified Purchase
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3.0 out of 5 stars Too tight in the instep
Reviewed in the United States on January 25, 2024
I used it to take my dog ​​out for 30 minutes and the top of my foot hurt and my heel was too tight. It was unbearable, I had to return them. Maybe I'll try ordering a half size up.
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Top reviews from other countries

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Tania Guatemala
5.0 out of 5 stars Uno de mis tenis favoritos de ahora en adelante
Reviewed in Mexico on March 6, 2024
Size: 8Color: Ice Purple/White/Rose ToneVerified Purchase
Aurora Morales
5.0 out of 5 stars Hermosooos
Reviewed in Mexico on August 31, 2023
Size: 6Color: White/Black/Solar YellowVerified Purchase
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Aurora Morales
5.0 out of 5 stars Hermosooos
Reviewed in Mexico on August 31, 2023
Súper cómodos y ligeros ya sea que salgas a correr trotar o bailar sentirás que caminas en las nubes, ademas súper bonitos
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giuliano
5.0 out of 5 stars GREAT PURCHASE
Reviewed in Canada on July 9, 2023
Size: 11.5Color: Black/Black/GreyVerified Purchase
mickey doodles
4.0 out of 5 stars Slide in shoes no socks necessary
Reviewed in Canada on June 1, 2022
Size: 6.5Color: Black/Black/Violet ToneVerified Purchase
C Z
5.0 out of 5 stars Perfect ultra boost fit as usual. Amazing look in the blue/white
Reviewed in Canada on December 28, 2021