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.

Shoe Aunisex
Allbirds Tree Runner Go
4.6(567 reviews)
Fit TendencyRuns Small (-4mm)
Width ProfileStandard (Medium)
View Full Tree Runner Go Breakdown
Shoe Bunisex
Allbirds Wool Runner
4.6(3,196 reviews)
Fit TendencyRuns Small (-4mm)
Width ProfileStandard (Medium)
View Full Wool Runner Breakdown
Fit Verdict

True to Size Comparison

Both shoes share a very similar length profile. We recommend ordering your standard size in both.

Length Delta0 mm
Width DeltaIdentical

Interactive Size Converter

Select what size you wear in the Tree Runner Go to see your calculated size in the Wool Runner.

Recommended Size in Allbirds Wool Runner
US 8.5100% Match

Internal shoe cavity difference: 0.0 mm (snugger)

Complete Size Conversion Matrix

Direct millimeter-calibrated mapping comparing all available sizes between both shoes.

Tree Runner Go (US)Internal CavityWool Runner EquivalentMatch AccuracyFit Difference
US 3.5236 mmUS 3.5100%0.0 mm
US 4239 mmUS 4100%0.0 mm
US 4.5243 mmUS 4.5100%0.0 mm
US 5246 mmUS 5100%0.0 mm
US 5.5249 mmUS 5.5100%0.0 mm
US 6253 mmUS 6100%0.0 mm
US 6.5256 mmUS 6.5100%0.0 mm
US 7263 mmUS 7100%0.0 mm
US 7.5266 mmUS 7.5100%0.0 mm
US 8269 mmUS 8100%0.0 mm
US 8.5273 mmUS 8.5100%0.0 mm
US 9276 mmUS 9100%0.0 mm
US 9.5279 mmUS 9.5100%0.0 mm
US 10283 mmUS 10100%0.0 mm
US 10.5286 mmUS 10.5100%0.0 mm
US 11289 mmUS 11100%0.0 mm
US 11.5293 mmUS 11.5100%0.0 mm
US 12296 mmUS 12100%0.0 mm
US 12.5299 mmUS 12.5100%0.0 mm
US 13303 mmUS 13100%0.0 mm
US 14309 mmUS 14100%0.0 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 -4mm compared to -4mm for the Wool Runner.

Do these shoes fit wide feet comfortably?

The Tree Runner Go has a standard medium width profile, while the Wool Runner is standard medium.