Short answer
The Asics GEL-Kayano 31 introduces a key architectural shift by transitioning to an engineered mesh upper, which alters the internal volume to deliver a remarkably snug and secure wrap around the midfoot and instep. While the physical length of the shoe fits true to size (TTS) according to broad consensus, the increased thickness of the mesh reduces vertical clearance.
Runs true to size
Cross-sizing: what size to buy
Find a shoe you already own and read across to the Asics Gel-Kayano 31 size to buy.
| Reference Shoe | US | EU | ||
|---|---|---|---|---|
| Your usual | Buy | Your usual | Buy | |
| Nike Air Force 1 | 10 | 10.5 | 44 | 44.5 |
| Brooks Glycerin GTS 21 | 10 | 10.0 (or 10.0 Wide) | 44 | 44 (or 44 Wide) |
| Brooks Adrenaline GTS 24 | 10 | 10.0 | 44 | 44 |
| New Balance Fresh Foam X 860v14 | 10 | 10.0 | 44 | 44 |
-
Nike Air Force 1
Your usual Buy US 10 10.5 EU 44 44.5 -
Brooks Glycerin GTS 21
Your usual Buy US 10 10.0 (or 10.0 Wide) EU 44 44 (or 44 Wide) -
Brooks Adrenaline GTS 24
Your usual Buy US 10 10.0 EU 44 44 -
New Balance Fresh Foam X 860v14
Your usual Buy US 10 10.0 EU 44 44
Fit Notes
- Nike Air Force 1
- The Nike Air Force 1 runs notoriously large and features an exceptionally roomy, boxy toe box profile. When transitioning to the snug, high-volume performance upper of the GEL-Kayano 31, runners must size up by a half size to achieve a comparable fit and prevent severe toe crowding against the thicker mesh.
- Brooks Glycerin GTS 21
- The Glycerin GTS 21 provides a wider, more naturally foot-shaped toe box and an accommodating rearfoot. Standard widths of the Kayano 31 run tighter and may rub the pinky toe. Address the compensation factor: if you previously sized up in length in other brands purely to secure extra lateral relief, you should return to your true structural length size (US 10 / EU 44) here but select the dedicated wide configuration to avoid an overly long shoe that risks heel slippage.
- Brooks Adrenaline GTS 24
- Both models run true to size in length, but they distribute internal volume differently. The Adrenaline GTS 24 is built with a highly rigid, stiff heel cup and a lower overall upper volume. In contrast, the Kayano 31 offers a premium, plusher cushioned ankle collar and a slightly roomier midfoot base, allowing for a comfortable direct size match.
- New Balance Fresh Foam X 860v14
- The 860v14 features an updated, broader toe box design. While both shoes align perfectly on a true-to-size length spectrum, the Kayano 31 utilizes significantly thicker, more luxurious heel padding that effectively reduces the perceived interior volume, resulting in a snugger overall fit character.
Sizing FAQ
Does the Asics GEL-Kayano 31 run true to size?
In terms of pure length, the general consensus indicates that the GEL-Kayano 31 fits true to size. However, the transition to a thicker engineered mesh upper reduces the available internal volume and creates a very snug wrap around the midfoot and instep. This design can cause the shoe to feel shorter than its nominal measurements, prompting some runners to size up by a half size to avoid toe friction and ensure long-term comfort.
Is the Asics GEL-Kayano 31 good for wide feet?
The standard width profile of the GEL-Kayano 31 may feel restrictive for wide feet, often causing uncomfortable bulging along the lateral sides and excessive pressure on the pinky toe. Fortunately, Asics offers the shoe in dedicated wide (2E) and extra-wide (4E) options for men, and wide options for women. Wide-footed individuals should opt directly for these specialized width sizes rather than sizing up in length, ensuring proper toe splay and a stable platform.
How is the arch support on the Asics GEL-Kayano 31?
The GEL-Kayano 31 features the innovative 4D Guidance System, an adaptive support technology that replaces traditional rigid medial posts with a resilient, bouncy medial foam block that compresses to absorb force and rebounds to guide the foot into neutral alignment. The arch structure sits slightly higher than the previous version, providing robust support that helps mitigate overpronation and alleviate plantar fasciitis. Note that it requires a short break-in period for the foam to comfortably mold to the foot.
Specs & Sizing
| Weight | 305 g |
|---|---|
| Retail price | $165 |
| Price on Amazon | 127-165 |
| Release year | 2024 |
| Upper | Engineered mesh for breathability and adaptability, with plush tongue and heel collar |
| Midsole | FF Blast+ Eco foam with PureGEL in the heel for cushioning and shock absorption |
| Outsole | Hybrid ASICSGRIP rubber for traction and durability |
| Technologies | 4D Guidance System, PureGEL, FF Blast+ Eco, Ortholite X-55 sockliner |
| Fit & sizing | True to size, consider half size up if toe box feels tight |