adidas Women's Ultraboost 21 Running Shoe

4.5 4.5 out of 5 stars 4,893 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 4,893 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
4,893 global ratings

Customers say

Customers like the support, versatility, and appearance of the shoes. For example, they mention they're great for running and walking, with a great tread for road running. Some appreciate the look, saying the laces are mostly decorative. That said, opinions are mixed on fit and weight.

AI-generated from the text of customer reviews

191 customers mention148 positive43 negative

Customers like the comfort of the shoes. They mention that it hugs their feet, has a lot of cushioning when they walk, and the support is spot on. Some say that the shoes are not too heavy and 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 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...." Read more

"...pair of Ultraboost. To me, they are the best, most comfortable athletic shoes I have ever worn and I only wear Ultraboost now...." Read more

87 customers mention64 positive23 negative

Customers like the quality of the shoes. They say that they are well made, hold up, and look great. Some say that the shoes improve functional endurance and are great for long work days.

"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

"Flimsy, cheaply made. Can get better and elsewhere." Read more

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

59 customers mention48 positive11 negative

Customers like the appearance of the shoes. For example, they say they look sharp, the lace is mostly decorative, and the color combo is great. Some mention that 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

"...Very strange design." Read more

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

29 customers mention21 positive8 negative

Customers like the versatility of the shoes. They mention that they are great for running and walking, with great tread for road running. They are also a great shoe for working out, walking long distances, and tennis. They provide great support for running, and are perfect for marathon runs. Customers also mention that the shoes are good for doing everything from exercising to lounging around the house.

"This is ultimately a great shoe for working out. Very comfortable and fits well!..." Read more

"I love these so comfy fit true to size and are great for walking long distances" Read more

"...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

"...Amazing for walking in like a Disney day. Not a running shoe! Just walking, it’s amaaaaazing!" 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.

"...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

"...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

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

"...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...." 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

21 customers mention13 positive8 negative

Customers are mixed about the weight of the shoes. Some mention that it's lightweight, while others say that it is bulky and heavy for jogging. The soles are very large and thick, making them feel like a clown shoe.

"...They felt big and bulky just out of the box, the sole does not feel as soft as it looks...." Read more

"It was for my daughter, it is comfortable and light weight so she likes it very much" Read more

"...Still super lightweight, but something about the new sole and snugger sock-like fit makes them SO MUCH BETTER. I highly recommend...." Read more

"...if not more so than my older pairs but they just look very bulky with my clothes...." 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
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Reviewed in the United States on May 15, 2023
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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