Glycerin v20
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).
Your size, to start
Start with your usual size unless strong runner evidence says otherwise. We don't yet have enough validated reports to confidently recommend a length-size change for the Brooks Glycerin 20 (Men's).
Own the Brooks Glycerin 20 (Men's)? A 20-second fit report helps other runners.
Add my fit reportCommunity reports
Across the full report set, this many called the shoe true to size.
Reports linked to a public source you can open and verify.
Signals for hotspots, blisters, or other pain points across the full report set.
Runner notes are AI-extracted sizing summaries from public running-shoe discussions. They are not quotes.
| 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 | Reported fit vs New Balance Fresh Foam 1080 13 (Men's) — true to length, true to width. | No issues | Mar 2026 |
Asics Novablast 5 (Women's) Size 8.5 | 8.5 | Slightly longTrue to width | Reported fit vs Asics Novablast 5 (Women's) — true to width. | No issues | Mar 2026 |
Brooks Hyperion Max 2 (Women's) Size 9.5 | 9.5 | True to sizeSlightly wide | Reported fit vs Brooks Hyperion Max 2 (Women's) — true to length, slightly wide. | No issues | Mar 2026 |
Brooks Ghost 17 (Men's) Size 14 | 14 | True to sizeTrue to width | Reported fit vs Brooks Ghost 17 (Men's) — true to length, true to width. | No issues | Mar 2026 |
On Cloudsurfer Next (Women's) Size 6 | 6 | True to sizeTrue to width | Reported fit vs On Cloudsurfer Next (Women's) — true to length, true to width. | No issues | Mar 2026 |
On Cloudmonster 2 (Women's) Size 6 | 6 | True to sizeTrue to width | Reported fit vs On Cloudmonster 2 (Women's) — true to length, true to width. | No issues | Mar 2026 |
Nike Pegasus 42 (Women's) Size 10 | 10.5 | True to sizeSlightly narrow | Reported fit vs Nike Pegasus 42 (Women's) — true to length, slightly narrow. | No issues | Mar 2026 |
New Balance Fresh Foam 1080 13 (Women's) Size 12.5 wide | 13 regular | True to sizeSlightly narrow | Reported fit vs New Balance Fresh Foam 1080 13 (Women's) — true to length, slightly narrow, snug toebox. | No issues | Mar 2026 |
Hoka Bondi 9 (Men's) Size 9W | 9W | True to sizeTrue to width | Reported fit vs Hoka Bondi 9 (Men's) — true to length, true to width. | No issues | Mar 2026 |
New Balance Fresh Foam 1080 12 (Women's) Size 7.5M Wide | 7.5M | True to sizeTrue to width | Reported fit vs New Balance Fresh Foam 1080 12 (Women's) — true to length, true to width. | No issues | Mar 2026 |
Reported fit vs New Balance Fresh Foam 1080 13 (Men's) — true to length, true to width.
Reported fit vs Asics Novablast 5 (Women's) — true to width.
Reported fit vs Brooks Hyperion Max 2 (Women's) — true to length, slightly wide.
Reported fit vs Brooks Ghost 17 (Men's) — true to length, true to width.
Reported fit vs On Cloudsurfer Next (Women's) — true to length, true to width.
Reported fit vs On Cloudmonster 2 (Women's) — true to length, true to width.
Reported fit vs Nike Pegasus 42 (Women's) — true to length, slightly narrow.
Reported fit vs New Balance Fresh Foam 1080 13 (Women's) — true to length, slightly narrow, snug toebox.
Reported fit vs Hoka Bondi 9 (Men's) — true to length, true to width.
Reported fit vs New Balance Fresh Foam 1080 12 (Women's) — true to length, true to width.
Compare with popular shoes
See how the Brooks Glycerin (Men's) fits side-by-side with shoes runners know well.
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