True-to-Size Millimeter Sizing Comparison
Franco Sarto Carolynn vs Franco Sarto Cason Loafer
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 Carolynn to see your calculated size in the Cason Loafer.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| Carolynn (US) | Internal Cavity | Cason Loafer Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 3.5 | 241 mm | US 5.5 | 95% | -0.4 mm |
| US 4 | 244 mm | US 6 | 95% | -0.4 mm |
| US 4.5 | 248 mm | US 6.5 | 95% | -0.4 mm |
| US 5 | 251 mm | US 7 | 95% | -0.4 mm |
| US 5.5 | 254 mm | US 7.5 | 95% | -0.4 mm |
| US 6 | 258 mm | US 8 | 95% | -0.4 mm |
| US 6.5 | 261 mm | US 8.5 | 95% | -0.4 mm |
| US 7 | 268 mm | US 9 | 95% | -0.4 mm |
| US 7.5 | 271 mm | US 9.5 | 95% | -0.4 mm |
| US 8 | 274 mm | US 10 | 95% | -0.4 mm |
| US 8.5 | 278 mm | US 10.5 | 95% | -0.4 mm |
| US 9 | 281 mm | US 11 | 95% | -0.4 mm |
| US 9.5 | 284 mm | US 11 | 59% | -3.4 mm |
| US 10 | 288 mm | US 11 | 12% | -7.4 mm |
| US 10.5 | 291 mm | US 11 | 0% | -10.4 mm |
| US 11 | 294 mm | US 11 | 0% | -13.4 mm |
| US 11.5 | 298 mm | US 11 | 0% | -17.4 mm |
| US 12 | 301 mm | US 11 | 0% | -20.4 mm |
| US 12.5 | 304 mm | US 11 | 0% | -23.4 mm |
| US 13 | 308 mm | US 11 | 0% | -27.4 mm |
| US 14 | 314 mm | US 11 | 0% | -33.4 mm |
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Frequently Asked Questions
How does the Carolynn size compare to the Cason Loafer?
Both shoes share a very similar length profile. We recommend ordering your standard size in both. The Carolynn has an internal fit offset of 0.96mm compared to 0.52mm for the Cason Loafer.
Do these shoes fit wide feet comfortably?
The Carolynn has a snug/narrow width profile, while the Cason Loafer is roomy/wide.