True-to-Size Millimeter Sizing Comparison

Allbirds Tree Runner vs Brooks Addiction Walker 2

Detailed size conversion chart, cavity measurements in millimeters, and crowd-sourced fit advice for choosing your perfect size.

Shoe Aunisex
Allbirds Tree Runner
4.7(6,450 reviews)
Fit TendencyTrue to Size
Width ProfileStandard (Medium)
View Full Tree Runner Breakdown
Shoe Bmen
Brooks Addiction Walker 2
4.0(2,055 reviews)
Fit TendencyRuns Small (-4mm)
Width ProfileStandard (Medium)
View Full Addiction Walker 2 Breakdown
Fit Verdict

Addiction Walker 2 Runs Slightly Smaller

The Addiction Walker 2 is about 4mm shorter than the Tree Runner. We suggest ordering 1/2 size up in Addiction Walker 2.

Length Delta-4 mm
Width DeltaIdentical

Interactive Size Converter

Select what size you wear in the Tree Runner to see your calculated size in the Addiction Walker 2.

Recommended Size in Brooks Addiction Walker 2
US 988% Match

Internal shoe cavity difference: -1.0 mm (snugger)

Alternate option if between sizes: US 9.5 (76% match)

Complete Size Conversion Matrix

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

Tree Runner (US)Internal CavityAddiction Walker 2 EquivalentMatch AccuracyFit Difference
US 3.5240 mmUS 70%+23.0 mm
US 4243 mmUS 70%+20.0 mm
US 4.5247 mmUS 70%+16.0 mm
US 5250 mmUS 70%+13.0 mm
US 5.5253 mmUS 70%+10.0 mm
US 6257 mmUS 729%+6.0 mm
US 6.5260 mmUS 765%+3.0 mm
US 7267 mmUS 7.588%-1.0 mm
US 7.5270 mmUS 888%-1.0 mm
US 8273 mmUS 8.5100%0.0 mm
US 8.5277 mmUS 988%-1.0 mm
US 9280 mmUS 9.588%-1.0 mm
US 9.5283 mmUS 10100%0.0 mm
US 10287 mmUS 10.588%-1.0 mm
US 10.5290 mmUS 1188%-1.0 mm
US 11293 mmUS 11.5100%0.0 mm
US 11.5297 mmUS 1288%-1.0 mm
US 12300 mmUS 12.588%-1.0 mm
US 12.5303 mmUS 13100%0.0 mm
US 13307 mmUS 1476%+2.0 mm
US 14313 mmUS 1453%-4.0 mm

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Frequently Asked Questions

How does the Tree Runner size compare to the Addiction Walker 2?

The Addiction Walker 2 is about 4mm shorter than the Tree Runner. We suggest ordering 1/2 size up in Addiction Walker 2. The Tree Runner has an internal fit offset of 0mm compared to -4mm for the Addiction Walker 2.

Do these shoes fit wide feet comfortably?

The Tree Runner has a standard medium width profile, while the Addiction Walker 2 is standard medium.