Daily trainer · Neutral · Road · 12 oz
Discontinued — we no longer see this shoe in stock. The adidas UltraBOOST 22 replaced it
How it ranks
The adidas UltraBOOST 21 sits about average for daily trainers in our data. Cushioning and durability are its strongest sub-ratings. The rating rests on 4 runner reviews and 6 other rated shoes in the Ultraboost product line. Another 8 reviews would set the confidence on this shoe's own reviews.
Confidence
How settled the rating is against every other rated shoe. A shoe can rate high on confidence with relatively few reviews of its own when its product line has a long record and external ratings from retailer sites agree. Confidence will score low when we have few ratings or when runners disagree.
Confidence
51/100
0% 0/3
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Prices updated daily. Last checked Sep 14.
Rating & Confidence vs. other shoes for sale
Each dot is one rated shoe for sale, placed by its rating and by how much evidence sits behind it. Shoes toward the top right are both well rated and well established.
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Better Shoes Rating
Each dot is one version of the Ultraboost, placed by its rating and release year. The gold dot is this shoe.
Release year
2025 · 1 review
86 Good
33 Confidence
2022 · 7 reviews
89 Good
68 Confidence
UltraBOOST 21 This shoe
2021 · 4 reviews
79 Decent
51 Confidence
2019 · 8 reviews
94 Excellent
87 Confidence
2019 · 14 reviews
95 Excellent
86 Confidence
2018 · 15 reviews
99 Exceptional
98 Confidence
2015 · 4 reviews
87 Good
71 Confidence
Sizing and ride details at a glance.
5/5
Overall
The 19s and 20s were amazing, feel faster maybe, these bring back the structure a fair bit.Both amazing shoes.
tim · Jul 2, 2023
50 mpw training for ultramarathons came from the adidas Ultraboost 20
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