Solid Trainer
Anonymous runner · Feb 3, 2025
5/5
Overall
Great everyday trainer, definitely not the fastest shoe, but definitely a reliable choice
- Comfort
- 5/5
- Cushioning
- 5/5
- Durability
- 4/5
- Appearance
- 4/5
- Value
- 5/5
Brooks
Glycerin 21
Daily trainer
· Neutral
· Road
Exceptional
(97/100)
- Weight
- 10 oz
- Release
- 2023 Q4
- Stack Height
- 38mm heel - 28mm toe
- Drop Height
- 10mm
Exceptional
(97/100)
overall
Shoe details
- Weight
- 10 oz
- Release
- 2023 Q4
- Stack Height
- 38mm heel - 28mm toe
- Drop Height
- 10mm
Ratings & Reviews
Exceptional (97/100)
Based on product-line history, external ratings, and runner reviews.
?
Scores better than 97% of all shoes.
Our ratings use detailed reviews from knowledgeable runners, ratings for shoes in the same product line, and reliable product information from trusted retailers.
Rating breakdown
Better Shoes Rating. Shading shows the expected rating range.
?
Rankings combine runner ratings, whether reviewers say they'd buy a shoe again, direct comparisons to other shoes, related product-line performance, and trusted external ratings.
The darker band shows the central rating range. The lighter band shows a wider range of reasonable outcomes. More reviews for this shoe usually narrow both bands.
Overall
Exceptional (97/100)
Overall 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
Exceptional (97/100)
Compared To Other Shoes
Scores better than 97% of shoes
Compared with all shoes
The shaded band shows the rating range we think is most likely.
Durability
Exceptional (99/100)
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
Exceptional (99/100)
Compared To Other Shoes
Scores better than 99% of shoes
Compared with all shoes
The shaded band shows the rating range we think is most likely.
Comfort
Exceptional (98/100)
Comfort 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
Exceptional (98/100)
Compared To Other Shoes
Scores better than 98% of shoes
Compared with all shoes
The shaded band shows the rating range we think is most likely.
Cushioning
Exceptional (99/100)
Cushioning 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
Exceptional (99/100)
Compared To Other Shoes
Scores better than 98% of shoes
Compared with all shoes
The shaded band shows the rating range we think is most likely.
Value
Good (77/100)
Value 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
Good (77/100)
Compared To Other Shoes
Scores better than 59% of shoes
Compared with all shoes
The shaded band shows the rating range we think is most likely.
Appearance
Good (77/100)
Appearance 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
Good (77/100)
Compared To Other Shoes
Scores better than 54% of shoes
Compared with all shoes
The shaded band shows the rating range we think is most likely.
57%
4/7
Prefer this shoe over another.
Reviewers said this shoe was better than another shoe they ran in.
Comparison set
Rating
All Running Shoes
Scores better than 97% of 2,617 running shoes.
Exceptional
Daily Trainers
Scores better than 96% of 1,872 daily trainers.
96%
Glycerin Family
Scores better than 64% of 10 glycerin family.
64%
Brooks
Scores better than 92% of 224 Brooks shoes.
92%
Pros & Cons
Pros
- A majority of reviewers like this shoe more than their last shoe.
- Popular shoe among LetsRun.com readers.
- Rated among the top 10% of shoes overall.
- Rated among the top 25% of shoes on comfort.
- Rated among the top 5% of shoes on cushioning.
Compared to other shoes
See how this shoe compares to others like it.
Current shoe
Best durability
Lightest
/
Newest
Best overall
/
Best comfort
/
Best cushioning
Shoe properties
Type
Daily trainer
Daily trainer
Daily trainer
Pronation
Neutral
Neutral
Neutral
Weight
10 oz M
9.1 oz M
Lightest
—
Stack
38/28mm
39/29mm
—
Drop
1mm
1mm
7mm
Release
2023 Q4
2025 Q1
Newest
2024 Q2
MSRP
—
$165
Lower MSRP
$200
Best price
—
—
$149.99
Ratings
Overall
Excellent (97%)
Excellent (90%)
Exceptional (>99%)
Best overall
Comfort
Exceptional (98%)
Excellent (97%)
Exceptional (99%)
Best comfort
Cushioning
Exceptional (98%)
Excellent (91%)
Exceptional (99%)
Best cushioning
Durability
Exceptional (99%)
Best durability
Exceptional (97%)
Exceptional (99%)
Appearance
Average (54%)
Below average (35%)
Exceptional (98%)
Best appearance
Value
Average (59%)
Average (57%)
Very good (86%)
Best value
Where to buy
No offers available
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More from Brooks
Reader Ratings
19 reader ratings
Showing 1–5 of 8 written reviews
Reader review
Anonymous runner · Dec 8, 2024
5/5
Overall
- Comfort
- 5/5
- Cushioning
- 5/5
- Durability
- 5/5
- Appearance
- 5/5
- Value
- 4/5
Excellent Shoe, Firm Cushioning
Anonymous runner · Dec 7, 2024
5/5
Overall
I’ll definitely buy these again. Solid trainers. No issues running 40 miles/week for 10 weeks. Good traction on most surfaces. Cushioning is good and firm. Some trainers make it feel like you’re running on a sponge. Not these ones.
- Comfort
- 4/5
- Cushioning
- 4/5
- Durability
- 5/5
- Appearance
- 4/5
- Value
- 5/5
Great sure, love the fit, feel and performance.
Anonymous runner · Nov 16, 2024
5/5
Overall
I’ve always struggled to find a good running shoe that fits my feet in width for the toe box and heel and still provide comfort, cushioning, and durability. The Brooks Glycerin 21 Mets all those needs.
- Comfort
- 5/5
- Cushioning
- 5/5
- Durability
- 5/5
- Appearance
- 5/5
- Value
- 4/5
Reader review
Anonymous runner · Jul 25, 2024
5/5
Overall
My 72 year old feet need comfort and softness to get my mileage in and these shoes do the job.
- Comfort
- 5/5
- Cushioning
- 5/5
- Durability
- 4/5
- Appearance
- 5/5
- Value
- 4/5