True-to-Size Millimeter Sizing Comparison
New Balance Fresh Foam Roav vs Nike Run Swift 3
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 Fresh Foam Roav to see your calculated size in the Run Swift 3.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| Fresh Foam Roav (US) | Internal Cavity | Run Swift 3 Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 4 | 220 mm | US 5 | 0% | +11.1 mm |
| US 4.5 | 225 mm | US 5 | 28% | +6.1 mm |
| US 5 | 230 mm | US 5 | 87% | +1.1 mm |
| US 5.5 | 235 mm | US 5.5 | 99% | +0.1 mm |
| US 6 | 240 mm | US 6.5 | 51% | +4.1 mm |
| US 6.5 | 245 mm | US 7 | 63% | +3.1 mm |
| US 7 | 250 mm | US 7.5 | 75% | +2.1 mm |
| US 7.5 | 255 mm | US 8 | 87% | +1.1 mm |
| US 8 | 260 mm | US 8.5 | 99% | +0.1 mm |
| US 8.5 | 265 mm | US 9 | 99% | +0.1 mm |
| US 9 | 270 mm | US 10 | 63% | +3.1 mm |
| US 9.5 | 275 mm | US 10.5 | 75% | +2.1 mm |
| US 10 | 280 mm | US 11 | 75% | +2.1 mm |
| US 10.5 | 285 mm | US 11.5 | 87% | +1.1 mm |
| US 11 | 290 mm | US 12 | 99% | +0.1 mm |
| US 11.5 | 295 mm | US 13 | 63% | +3.1 mm |
| US 12 | 300 mm | US 13.5 | 63% | +3.1 mm |
| US 12.5 | 305 mm | US 14 | 75% | +2.1 mm |
| US 13 | 310 mm | US 14.5 | 87% | +1.1 mm |
| US 13.5 | 315 mm | US 15 | 99% | +0.1 mm |
| US 14 | 320 mm | US 15.5 | 99% | +0.1 mm |
| US 14.5 | 325 mm | US 16.5 | 63% | +3.1 mm |
| US 15 | 330 mm | US 17 | 75% | +2.1 mm |
| US 15.5 | 335 mm | US 17.5 | 75% | +2.1 mm |
| US 16.5 | 345 mm | US 18.5 | 99% | +0.1 mm |
| US 17.5 | 355 mm | US 20 | 63% | +3.1 mm |
| US 18.5 | 365 mm | US 21 | 87% | +1.1 mm |
| US 19.5 | 375 mm | US 22 | 99% | +0.1 mm |
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Frequently Asked Questions
How does the Fresh Foam Roav size compare to the Run Swift 3?
Both shoes share a very similar length profile. We recommend ordering your standard size in both. The Fresh Foam Roav has an internal fit offset of -0.6mm compared to -0.48mm for the Run Swift 3.
Do these shoes fit wide feet comfortably?
The Fresh Foam Roav has a standard medium width profile, while the Run Swift 3 is snug/narrow.