True-to-Size Millimeter Sizing Comparison
Naot Kirei vs Naot Matai
Detailed size conversion chart, cavity measurements in millimeters, and crowd-sourced fit advice for choosing your perfect size.
Interactive Size Converter
Select what size you wear in the Kirei to see your calculated size in the Matai.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| Kirei (US) | Internal Cavity | Matai Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 4.5 | 229 mm | US 3.5 | 0% | +11.0 mm |
| US 5 | 233 mm | US 3.5 | 17% | +7.0 mm |
| US 5.5 | 236 mm | US 3.5 | 53% | +4.0 mm |
| US 6 | 239 mm | US 3.5 | 88% | +1.0 mm |
| US 6.5 | 243 mm | US 4 | 100% | 0.0 mm |
| US 7 | 246 mm | US 4.5 | 88% | +1.0 mm |
| US 7.5 | 249 mm | US 5 | 88% | +1.0 mm |
| US 8 | 253 mm | US 5.5 | 100% | 0.0 mm |
| US 8.5 | 256 mm | US 6 | 88% | +1.0 mm |
| US 9 | 263 mm | US 6.5 | 65% | -3.0 mm |
| US 9.5 | 266 mm | US 7 | 88% | +1.0 mm |
| US 10 | 269 mm | US 7.5 | 88% | +1.0 mm |
| US 10.5 | 273 mm | US 8 | 100% | 0.0 mm |
| US 11 | 276 mm | US 8.5 | 88% | +1.0 mm |
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Frequently Asked Questions
How does the Kirei size compare to the Matai?
The Matai provides about 4mm more internal length than the Kirei. We suggest ordering 1/2 size down in Matai. The Kirei has an internal fit offset of -4mm compared to 0mm for the Matai.
Do these shoes fit wide feet comfortably?
The Kirei has a standard medium width profile, while the Matai is standard medium.