True-to-Size Millimeter Sizing Comparison
Rocket Dog Jazzin vs Rocket Dog Rainbow
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 Jazzin to see your calculated size in the Rainbow.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| Jazzin (US) | Internal Cavity | Rainbow Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 3.5 | 248 mm | US 4.5 | 88% | -1.0 mm |
| US 4 | 251 mm | US 5 | 88% | -1.0 mm |
| US 4.5 | 255 mm | US 5.5 | 76% | -2.0 mm |
| US 5 | 258 mm | US 6 | 88% | -1.0 mm |
| US 5.5 | 261 mm | US 6.5 | 88% | -1.0 mm |
| US 6 | 265 mm | US 7 | 76% | +2.0 mm |
| US 6.5 | 268 mm | US 7 | 88% | -1.0 mm |
| US 7 | 275 mm | US 8 | 76% | -2.0 mm |
| US 7.5 | 278 mm | US 8.5 | 88% | -1.0 mm |
| US 8 | 281 mm | US 9 | 88% | -1.0 mm |
| US 8.5 | 285 mm | US 9.5 | 76% | -2.0 mm |
| US 9 | 288 mm | US 10 | 88% | -1.0 mm |
| US 9.5 | 291 mm | US 10.5 | 88% | -1.0 mm |
| US 10 | 295 mm | US 11 | 76% | -2.0 mm |
| US 10.5 | 298 mm | US 11.5 | 88% | -1.0 mm |
| US 11 | 301 mm | US 12 | 88% | -1.0 mm |
| US 11.5 | 305 mm | US 12.5 | 76% | -2.0 mm |
| US 12 | 308 mm | US 13 | 88% | -1.0 mm |
| US 12.5 | 311 mm | US 14 | 76% | +2.0 mm |
| US 13 | 315 mm | US 14 | 76% | -2.0 mm |
| US 14 | 321 mm | US 14 | 5% | -8.0 mm |
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Frequently Asked Questions
How does the Jazzin size compare to the Rainbow?
The Rainbow is about 8mm shorter than the Jazzin. We suggest ordering 1 full size up in Rainbow. The Jazzin has an internal fit offset of 8mm compared to 0mm for the Rainbow.
Do these shoes fit wide feet comfortably?
The Jazzin has a roomy/wide width profile, while the Rainbow is standard medium.