Glycerin v21
Width options: standard, wide (Men's) / standard, wide (Women's)
Imported family signal
30 of 32 runners said this shoe fit true to size.
Fit Notes
Runs slightly long. Consider half size down.
Sizing vs. popular reference shoes
| If you wear | Length | Width | Toebox | Reports |
|---|---|---|---|---|
Adidas Adizero Evo SL (Women's) 8.5100% 1 of 1 runners landed on 8.5 (0.5 weighted). | True to size | Slightly narrow | Snug toebox | Early reportsEarly Based on 1 reportUS 8.5-8.5 |
Asics Gel-Kayano 31 (Women's) 9100% 1 of 1 runners landed on 9 (0.5 weighted). | True to size | True to width | Good room | Early reportsEarly Based on 1 reportUS 9-9 |
Asics Gel-Nimbus 25 (Women's) US11.5100% 1 of 1 runners landed on US11.5 (0.5 weighted). | True to size | True to width | Good room | Early reportsEarly Based on 1 reportUS 11.5-11.5 |
Asics Gel-Nimbus 27 (Women's) 9100% 1 of 1 runners landed on 9 (0.5 weighted). | True to size | True to width | Good room | Early reportsEarly Based on 1 reportUS 9-9 |
Asics Gel-Trabuco 12 (Men's) EU40.5100% 1 of 1 runners landed on EU40.5 (0.5 weighted). | True to size | True to width | Good room | Early reportsEarly Based on 1 reportUS 40.5-40.5 |
Asics Metaspeed Sky+ (Women's) 9100% 1 of 1 runners landed on 9 (0.5 weighted). | True to size | True to width | Good room | Early reportsEarly Based on 1 reportUS 9-9 |
Asics Novablast 4 (Women's) 9100% 1 of 1 runners landed on 9 (0.5 weighted). | True to size | True to width | Good room | Early reportsEarly Based on 1 reportUS 9-9 |
Asics Superblast 1 (Women's) 12100% 1 of 1 runners landed on 12 (0.5 weighted). | True to size | True to width | Good room | Early reportsEarly Based on 1 reportUS 12-12 |
Brooks Ghost 15 (Women's) 7.5100% 1 of 1 runners landed on 7.5 (0.5 weighted). | True to size | Slightly wide | Good room | Early reportsEarly Based on 1 reportUS 7.5-7.5 |
Brooks Ghost 17 (Men's) 14100% 1 of 1 runners landed on 14 (0.5 weighted). | True to size | True to width | Good room | Early reportsEarly Based on 1 reportUS 14-14 |
Brooks Hyperion Max 2 (Women's) 9.5100% 1 of 1 runners landed on 9.5 (0.5 weighted). | True to size | Slightly wide | Good room | Early reportsEarly Based on 1 reportUS 9.5-9.5 |
Hoka Arahi 6 (Women's) 11100% 1 of 1 runners landed on 11 (0.5 weighted). | True to size | True to width | Good room | Early reportsEarly Based on 1 reportUS 11-11 |
Hoka Bondi 9 (Men's) 9W100% 1 of 1 runners landed on 9W (0.5 weighted). | True to size | True to width | Good room | Early reportsEarly Based on 1 reportUS 9-9 |
Hoka Clifton 10 (Women's) 11.5100% 1 of 1 runners landed on 11.5 (0.5 weighted). | True to size | Slightly wide | Roomy toebox | Early reportsEarly Based on 1 reportUS 11.5-11.5 |
Hoka Mach 6 (Women's) 11.5100% 1 of 1 runners landed on 11.5 (0.5 weighted). | True to size | Slightly wide | Roomy toebox | Early reportsEarly Based on 1 reportUS 11.5-11.5 |
New Balance Fresh Foam 1080 12 (Women's) 7.5M100% 1 of 1 runners landed on 7.5M (0.5 weighted). | True to size | True to width | Good room | Early reportsEarly Based on 1 reportUS 7.5-7.5 |
New Balance Fresh Foam 1080 13 (Men's) 10.5100% 1 of 1 runners landed on 10.5 (0.5 weighted). | True to size | True to width | Good room | Early reportsEarly Based on 1 reportUS 10.5-10.5 |
New Balance Fresh Foam 1080 13 (Women's) 13 regular100% 1 of 1 runners landed on 13 regular (0.5 weighted). | True to size | Slightly narrow | Snug toebox | Early reportsEarly Based on 1 reportUS 13-13 |
New Balance Fresh Foam 860 13 (Women's) 8100% 1 of 1 runners landed on 8 (0.5 weighted). | True to size | True to width | Roomy toebox | Early reportsEarly Based on 1 reportUS 8-8 |
New Balance More 4 (Women's) US11.5100% 1 of 1 runners landed on US11.5 (0.5 weighted). | True to size | True to width | Good room | Early reportsEarly Based on 1 reportUS 11.5-11.5 |
Nike Pegasus 39 (Women's) 6D100% 1 of 1 runners landed on 6D (0.5 weighted). | True to size | Very narrow | Good room | Early reportsEarly Based on 1 reportUS 6-6 |
On Cloudmonster 2 (Women's) 6100% 1 of 1 runners landed on 6 (0.5 weighted). | True to size | True to width | Good room | Early reportsEarly Based on 1 reportUS 6-6 |
On Cloudsurfer Next (Women's) 6100% 1 of 1 runners landed on 6 (0.5 weighted). | True to size | True to width | Good room | Early reportsEarly Based on 1 reportUS 6-6 |
Saucony Endorphin Pro 3 (Women's) 11.5100% 1 of 1 runners landed on 11.5 (0.5 weighted). | True to size | Slightly wide | Roomy toebox | Early reportsEarly Based on 1 reportUS 11.5-11.5 |
Saucony Endorphin Speed 4 (Women's) 8.5 2E100% 1 of 1 runners landed on 8.5 2E (0.5 weighted). | True to size | True to width | Good room | Early reportsEarly Based on 1 reportUS 8.52-8.52 |
Asics Novablast 5 (Women's) 8.5100% 1 of 1 runners landed on 8.5 (0.4 weighted). | Some go half size down | True to width | Good room | Early reportsEarly Based on 1 reportUS 8.5-8.5 |
Saucony Endorphin Speed 4 (Men's) 10100% 1 of 1 runners landed on 10 (0.4 weighted). | Some go half size down | True to width | Good room | Early reportsEarly Based on 1 reportUS 10-10 |
Hoka Bondi 7 (Women's) unknown100% 1 of 1 runners landed on unknown (0.5 weighted). | True to size | True to width | Good room | Early reportsEarly Based on 1 report |
Brooks Ghost 17 (Women's) 850%950% 1 of 2 runners landed on 8 (0.9 weighted). | True to size | True to width | Good room | Early reportsEarly Based on 2 reportsUS 8-9 |
Nike Pegasus 42 (Women's) 7.550%10.550% 1 of 2 runners landed on 10.5 (0.9 weighted). | True to size | True to width | Roomy toebox | Early reportsEarly Based on 2 reportsUS 7.5-10.5 |
1 of 1 runners landed on 8.5 (0.5 weighted).
1 of 1 runners landed on 9 (0.5 weighted).
1 of 1 runners landed on US11.5 (0.5 weighted).
1 of 1 runners landed on 9 (0.5 weighted).
1 of 1 runners landed on EU40.5 (0.5 weighted).
1 of 1 runners landed on 9 (0.5 weighted).
1 of 1 runners landed on 9 (0.5 weighted).
1 of 1 runners landed on 12 (0.5 weighted).
1 of 1 runners landed on 7.5 (0.5 weighted).
1 of 1 runners landed on 14 (0.5 weighted).
1 of 1 runners landed on 9.5 (0.5 weighted).
1 of 1 runners landed on 11 (0.5 weighted).
1 of 1 runners landed on 9W (0.5 weighted).
1 of 1 runners landed on 11.5 (0.5 weighted).
1 of 1 runners landed on 11.5 (0.5 weighted).
1 of 1 runners landed on 7.5M (0.5 weighted).
1 of 1 runners landed on 10.5 (0.5 weighted).
1 of 1 runners landed on 13 regular (0.5 weighted).
1 of 1 runners landed on 8 (0.5 weighted).
1 of 1 runners landed on US11.5 (0.5 weighted).
1 of 1 runners landed on 6D (0.5 weighted).
1 of 1 runners landed on 6 (0.5 weighted).
1 of 1 runners landed on 6 (0.5 weighted).
1 of 1 runners landed on 11.5 (0.5 weighted).
1 of 1 runners landed on 8.5 2E (0.5 weighted).
1 of 1 runners landed on 8.5 (0.4 weighted).
1 of 1 runners landed on 10 (0.4 weighted).
1 of 1 runners landed on unknown (0.5 weighted).
1 of 2 runners landed on 8 (0.9 weighted).
1 of 2 runners landed on 10.5 (0.9 weighted).
Community reports
Across the full report set, this many called the shoe true to size.
Reports with extra written context about what runners actually felt.
Signals for hotspots, blisters, or other pain points across the full report set.
| Came from | Bought | Verdict | Runner note | Issues | When |
|---|---|---|---|---|---|
New Balance Fresh Foam 1080 13 (Men's) Size 10.5 | 10.5 | True to sizeTrue to width | True to size (TTS 10.5), comfortable for recovery training | [gender: male/inferred] | [source: /r/RunningShoeGeeks/comments/1hfdeuw/brooks_glycerin_max_20_mile_review/] | No issues | Mar 2026 |
Asics Novablast 5 (Women's) Size 8.5 | 8.5 | Slightly longTrue to width | Novablast 2 is slightly longer than Glycerin 19 at same size, difference about 1/4 inch | [gender: female/inferred] | [source: /r/RunningShoeGeeks/comments/pstadc/novablast_2_should_i_size_down/] | No issues | Mar 2026 |
Brooks Hyperion Max 2 (Women's) Size 9.5 | 9.5 | True to sizeSlightly wide | Glycerin 22 accommodates wider midfoot better than Hyperion 2, which is too narrow in midfoot for this runner | [gender: female/explicit] | [source: /r/RunningShoeGeeks/comments/1i9z9z1/brooks_glycerin_22_first_run/] | No issues | Mar 2026 |
Brooks Ghost 17 (Men's) Size 14 | 14 | True to sizeTrue to width | comparable weight, Ghost weighs 4 grams more than Glycerin | [gender: male/inferred] | [source: /r/RunningShoeGeeks/comments/pdiswl/brooks_ghost_14_glycerin_19/] | No issues | Mar 2026 |
On Cloudsurfer Next (Women's) Size 6 | 6 | True to sizeTrue to width | Higher sole, softest and most comfortable. Shape fits feet correctly. Provides support from all directions. Softest insole, most support when jumping and running. No major problems identified. Personal favorite. | [gender: female/explicit] | [source: /r/running/comments/1bvykji/brooks_glycerin_21_brooks_ghost_max_on/] | No issues | Mar 2026 |
On Cloudmonster 2 (Women's) Size 6 | 6 | True to sizeTrue to width | Glycerin 21 is softer and more comfortable. Better shape fit. No topline rubbing issues like CloudMonster 2. Provides better support. | [gender: female/explicit] | [source: /r/running/comments/1bvykji/brooks_glycerin_21_brooks_ghost_max_on/] | No issues | Mar 2026 |
Nike Pegasus 42 (Women's) Size 10 | 10.5 | True to sizeSlightly narrow | Could feel midfoot pushing out the material | [gender: male/inferred] | [source: /r/running/comments/bn097b/running_shoes_trending_narrower_across_the_board/] | No issues | Mar 2026 |
New Balance Fresh Foam 1080 13 (Women's) Size 12.5 wide | 13 regular | True to sizeSlightly narrow | fit great after relacing for forefoot room, similar daily trainer role | [gender: male/inferred] | [source: /r/RunningShoeGeeks/comments/oo8ygd/novablast_2_for_wide_foot/] | No issues | Mar 2026 |
Hoka Bondi 9 (Men's) Size 9W | 9W | True to sizeTrue to width | wide enough for me in the right places | [ambiguity: Brooks model not specified; commenter mentions 'Brooks 9w' but no model name given] | [gender: female/inferred] | [source: /r/RunningShoeGeeks/comments/ytmghk/solutions_for_wide_foot_women/] | No issues | Mar 2026 |
New Balance Fresh Foam 1080 12 (Women's) Size 7.5M Wide | 7.5M | True to sizeTrue to width | no complaints on width at same size | [gender: male/inferred] | [source: /r/RunningShoeGeeks/comments/uj9l23/can_someone_help_clarify_new_balance_sizing/] | No issues | Mar 2026 |
True to size (TTS 10.5), comfortable for recovery training | [gender: male/inferred] | [source: /r/RunningShoeGeeks/comments/1hfdeuw/brooks_glycerin_max_20_mile_review/]
Novablast 2 is slightly longer than Glycerin 19 at same size, difference about 1/4 inch | [gender: female/inferred] | [source: /r/RunningShoeGeeks/comments/pstadc/novablast_2_should_i_size_down/]
Glycerin 22 accommodates wider midfoot better than Hyperion 2, which is too narrow in midfoot for this runner | [gender: female/explicit] | [source: /r/RunningShoeGeeks/comments/1i9z9z1/brooks_glycerin_22_first_run/]
comparable weight, Ghost weighs 4 grams more than Glycerin | [gender: male/inferred] | [source: /r/RunningShoeGeeks/comments/pdiswl/brooks_ghost_14_glycerin_19/]
Higher sole, softest and most comfortable. Shape fits feet correctly. Provides support from all directions. Softest insole, most support when jumping and running. No major problems identified. Personal favorite. | [gender: female/explicit] | [source: /r/running/comments/1bvykji/brooks_glycerin_21_brooks_ghost_max_on/]
Glycerin 21 is softer and more comfortable. Better shape fit. No topline rubbing issues like CloudMonster 2. Provides better support. | [gender: female/explicit] | [source: /r/running/comments/1bvykji/brooks_glycerin_21_brooks_ghost_max_on/]
Could feel midfoot pushing out the material | [gender: male/inferred] | [source: /r/running/comments/bn097b/running_shoes_trending_narrower_across_the_board/]
fit great after relacing for forefoot room, similar daily trainer role | [gender: male/inferred] | [source: /r/RunningShoeGeeks/comments/oo8ygd/novablast_2_for_wide_foot/]
wide enough for me in the right places | [ambiguity: Brooks model not specified; commenter mentions 'Brooks 9w' but no model name given] | [gender: female/inferred] | [source: /r/RunningShoeGeeks/comments/ytmghk/solutions_for_wide_foot_women/]
no complaints on width at same size | [gender: male/inferred] | [source: /r/RunningShoeGeeks/comments/uj9l23/can_someone_help_clarify_new_balance_sizing/]
Compare with popular shoes
See how the Brooks Glycerin (Men's) fits side-by-side with shoes runners know well.
Swipe to compare more shoes.
