Should I size up in the Asics Gel-Kayano 31 for thick socks or break-in?

Break-in: None. Thick socks add volume — try the sock you will wear with the usual size advice before jumping a full size. See the thick socks & boot break-in guides.

How does the Asics Gel-Kayano 31 compare to the Gel-1130?

Same brand, different last. Gel-Kayano 31: True to Size — True to size with correct width. Gel-1130: true to size — True to size. Open /asics/gel-1130/ or a model compare when available.

ASICS Gel-Kayano 31 Sizing: TTS, Use 2E/4E Width

True to Size True to size with correct width

VerifiedLast reviewed 2026-08-12

Runs smallTrue to sizeRuns big

Length usually matches a typical street size for this category.

Width note: Multiple widths on many SKUs

What size should you buy?

Your usual size

Interactive suggestion based on this model’s fit offset (+0 US). Always confirm with a retailer return policy.

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Measured / size chart (cm)

Numbers only when sourced. Empty fields stay blank — we do not invent mm.

Internal length: 27.5 cm (275 mm)
Forefoot width: 98.9 mm
Toebox width: 74.8 mm
Reference size: US_M9

Lab measurement · Source: RunRepeat lab · Updated: 2026-08-13

Lab cut at US men's 9. Long internal length vs many lifestyle sneakers — Kayano room is not an automatic size-down cue.

Know your foot length? Open the cm → size converter.

Asics size chart (foot-length cm)
US M	UK	EU	cm
6	5.5	38.5	23.4
6.5	6	39	23.9
7	6.5	40	24.4
7.5	7	40.5	24.9
8	7.5	41	25.3
8.5	8	42	25.8
9	8.5	42.5	26.1
9.5	9	43	26.6
10	9.5	44	27
10.5	10	44.5	27.4
11	10.5	45	27.8
11.5	11	45.5	28.3
12	11.5	46	28.7
13	12.5	47.5	29.6

Chart cm is approximate foot length for label matching — not a lab internal cut. Use the cm converter to map foot length across brands.

Fit scenarios

Width: Length and width are separate — see wide feet / narrow fit.

Width: Multiple widths on many SKUs
Break-in: None

Summary

ASICS Gel-Kayano 31 fits true to size in length when you pick the right width. The engineered mesh wrap can feel snug on high-volume feet — use 2E/4E rather than guessing with length. Lifestyle Kayano 14 sizing is a different conversation.

Sources: RunRepeat Kayano 31 (TTS, 274 owner votes) · SoleReview Kayano 31 (TTS; snug default — widths available) · Find My Footwear Kayano 31 vs 32 (TTS in regular ASICS size) · methodology

What size did you take?

Anonymous fit check for Asics Gel-Kayano 31. Helps future readers — we never invent crowd stats.

Community results stay private until 25 responses for this page — no fake percentages.

Prefer email? Fit feedback.

FAQ

Does the Asics Gel-Kayano 31 run big or small?: True to Size. True to size with correct width ASICS Gel-Kayano 31 fits true to size in length when you pick the right width. The engineered mesh wrap can feel snug on high-volume feet — use 2E/4E rather than guessing with length. Lifestyle Kayano 14 sizing is a different conversation.
What size should I buy in the Asics Gel-Kayano 31?: True to size with correct width
Should I size up in the Asics Gel-Kayano 31 for thick socks or break-in?: Break-in: None. Thick socks add volume — try the sock you will wear with the usual size advice before jumping a full size. See the thick socks & boot break-in guides.
How does the Asics Gel-Kayano 31 compare to the Gel-1130?: Same brand, different last. Gel-Kayano 31: True to Size — True to size with correct width. Gel-1130: true to size — True to size. Open /asics/gel-1130/ or a model compare when available.

Generic US / UK / EU / cm reference

Secondary Mondopoint-style table. Prefer the brand chart in Measured / size chart (cm) when converting. Primary system: US_M.

US	UK	EU	cm
6	5.5	39	24.0
6.5	6	39.5	24.5
7	6.5	40	25.0
7.5	7	40.5	25.5
8	7.5	41	26.0
8.5	8	42	26.5
9	8.5	42.5	27.0
9.5	9	43	27.5
10	9.5	44	28.0
10.5	10	44.5	28.5
11	10.5	45	29.0
11.5	11	45.5	29.5
12	11.5	46	30.0
13	12.5	47.5	31.0

Where to buy

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Kayano 31 sizing: true to size with the right width