True-to-Size Millimeter Sizing Comparison
Allbirds Tree Runner Go vs Allbirds Wool Runner
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 Tree Runner Go to see your calculated size in the Wool Runner.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| Tree Runner Go (US) | Internal Cavity | Wool Runner Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 3.5 | 239 mm | US 3.5 | 98% | -0.2 mm |
| US 4 | 242 mm | US 4 | 98% | -0.2 mm |
| US 4.5 | 246 mm | US 4.5 | 98% | -0.2 mm |
| US 5 | 249 mm | US 5 | 98% | -0.2 mm |
| US 5.5 | 252 mm | US 5.5 | 98% | -0.2 mm |
| US 6 | 256 mm | US 6 | 98% | -0.2 mm |
| US 6.5 | 259 mm | US 6.5 | 98% | -0.2 mm |
| US 7 | 266 mm | US 7 | 98% | -0.2 mm |
| US 7.5 | 269 mm | US 7.5 | 98% | -0.2 mm |
| US 8 | 272 mm | US 8 | 98% | -0.2 mm |
| US 8.5 | 276 mm | US 8.5 | 98% | -0.2 mm |
| US 9 | 279 mm | US 9 | 98% | -0.2 mm |
| US 9.5 | 282 mm | US 9.5 | 98% | -0.2 mm |
| US 10 | 286 mm | US 10 | 98% | -0.2 mm |
| US 10.5 | 289 mm | US 10.5 | 98% | -0.2 mm |
| US 11 | 292 mm | US 11 | 98% | -0.2 mm |
| US 11.5 | 296 mm | US 11.5 | 98% | -0.2 mm |
| US 12 | 299 mm | US 12 | 98% | -0.2 mm |
| US 12.5 | 302 mm | US 12.5 | 98% | -0.2 mm |
| US 13 | 306 mm | US 13 | 98% | -0.2 mm |
| US 14 | 312 mm | US 14 | 98% | -0.2 mm |
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Frequently Asked Questions
How does the Tree Runner Go size compare to the Wool Runner?
Both shoes share a very similar length profile. We recommend ordering your standard size in both. The Tree Runner Go has an internal fit offset of -0.52mm compared to -0.68mm for the Wool Runner.
Do these shoes fit wide feet comfortably?
The Tree Runner Go has a snug/narrow width profile, while the Wool Runner is standard medium.