True-to-Size Millimeter Sizing Comparison
SAS Duo Adjustable Comfort vs SAS Nudu Adjustable Comfort
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 Duo Adjustable Comfort to see your calculated size in the Nudu Adjustable Comfort.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| Duo Adjustable Comfort (US) | Internal Cavity | Nudu Adjustable Comfort Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 3.5 | 240 mm | US 3.5 | 96% | +0.3 mm |
| US 4 | 243 mm | US 4 | 96% | +0.3 mm |
| US 4.5 | 247 mm | US 4.5 | 96% | +0.3 mm |
| US 5 | 250 mm | US 5 | 96% | +0.3 mm |
| US 5.5 | 253 mm | US 5.5 | 96% | +0.3 mm |
| US 6 | 257 mm | US 6 | 96% | +0.3 mm |
| US 6.5 | 260 mm | US 6.5 | 96% | +0.3 mm |
| US 7 | 267 mm | US 7 | 96% | +0.3 mm |
| US 7.5 | 270 mm | US 7.5 | 96% | +0.3 mm |
| US 8 | 273 mm | US 8 | 96% | +0.3 mm |
| US 8.5 | 277 mm | US 8.5 | 96% | +0.3 mm |
| US 9 | 280 mm | US 9 | 96% | +0.3 mm |
| US 9.5 | 283 mm | US 9.5 | 96% | +0.3 mm |
| US 10 | 287 mm | US 10 | 96% | +0.3 mm |
| US 10.5 | 290 mm | US 10.5 | 96% | +0.3 mm |
| US 11 | 293 mm | US 11 | 96% | +0.3 mm |
| US 11.5 | 297 mm | US 11.5 | 96% | +0.3 mm |
| US 12 | 300 mm | US 12 | 96% | +0.3 mm |
| US 12.5 | 303 mm | US 12.5 | 96% | +0.3 mm |
| US 13 | 307 mm | US 13 | 96% | +0.3 mm |
| US 14 | 313 mm | US 14 | 96% | +0.3 mm |
Frequently Asked Questions
How does the Duo Adjustable Comfort size compare to the Nudu Adjustable Comfort?
Both shoes share a very similar length profile. We recommend ordering your standard size in both. The Duo Adjustable Comfort has an internal fit offset of -0.2mm compared to 0.12mm for the Nudu Adjustable Comfort.
Do these shoes fit wide feet comfortably?
The Duo Adjustable Comfort has a snug/narrow width profile, while the Nudu Adjustable Comfort is snug/narrow.