True-to-Size Millimeter Sizing Comparison
SOUL Naturalizer Gift Flat vs SOUL Naturalizer Kacy 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 Gift Flat to see your calculated size in the Kacy Loafer.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| Gift Flat (US) | Internal Cavity | Kacy Loafer Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 4.5 | 233 mm | US 4.5 | 97% | +0.3 mm |
| US 5 | 237 mm | US 5 | 97% | +0.3 mm |
| US 5.5 | 240 mm | US 5.5 | 97% | +0.3 mm |
| US 6 | 243 mm | US 6 | 97% | +0.3 mm |
| US 6.5 | 247 mm | US 6.5 | 97% | +0.3 mm |
| US 7 | 250 mm | US 7 | 97% | +0.3 mm |
| US 7.5 | 253 mm | US 7.5 | 97% | +0.3 mm |
| US 8 | 257 mm | US 8 | 97% | +0.3 mm |
| US 8.5 | 260 mm | US 8.5 | 97% | +0.3 mm |
| US 9 | 267 mm | US 9 | 97% | +0.3 mm |
| US 9.5 | 270 mm | US 9.5 | 97% | +0.3 mm |
| US 10 | 273 mm | US 10 | 97% | +0.3 mm |
| US 10.5 | 277 mm | US 10.5 | 97% | +0.3 mm |
| US 11 | 280 mm | US 11 | 97% | +0.3 mm |
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Frequently Asked Questions
How does the Gift Flat size compare to the Kacy Loafer?
Both shoes share a very similar length profile. We recommend ordering your standard size in both. The Gift Flat has an internal fit offset of -0.16mm compared to 0.12mm for the Kacy Loafer.
Do these shoes fit wide feet comfortably?
The Gift Flat has a snug/narrow width profile, while the Kacy Loafer is roomy/wide.