True-to-Size Millimeter Sizing Comparison
Kelly & Katie Caital vs Kelly & Katie Hailee
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 Caital to see your calculated size in the Hailee.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| Caital (US) | Internal Cavity | Hailee Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 4.5 | 233 mm | US 4.5 | 98% | -0.2 mm |
| US 5 | 237 mm | US 5 | 98% | -0.2 mm |
| US 5.5 | 240 mm | US 5.5 | 98% | -0.2 mm |
| US 6 | 243 mm | US 6 | 98% | -0.2 mm |
| US 6.5 | 247 mm | US 6.5 | 98% | -0.2 mm |
| US 7 | 250 mm | US 7 | 98% | -0.2 mm |
| US 7.5 | 253 mm | US 7.5 | 98% | -0.2 mm |
| US 8 | 257 mm | US 8 | 98% | -0.2 mm |
| US 8.5 | 260 mm | US 8.5 | 98% | -0.2 mm |
| US 9 | 267 mm | US 9 | 98% | -0.2 mm |
| US 9.5 | 270 mm | US 9.5 | 98% | -0.2 mm |
| US 10 | 273 mm | US 10 | 98% | -0.2 mm |
| US 10.5 | 277 mm | US 10.5 | 98% | -0.2 mm |
| US 11 | 280 mm | US 11 | 98% | -0.2 mm |
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Frequently Asked Questions
How does the Caital size compare to the Hailee?
Both shoes share a very similar length profile. We recommend ordering your standard size in both. The Caital has an internal fit offset of 0.28mm compared to 0.12mm for the Hailee.
Do these shoes fit wide feet comfortably?
The Caital has a roomy/wide width profile, while the Hailee is snug/narrow.