True-to-Size Millimeter Sizing Comparison

Allbirds Wool 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 Wool Runner
4.6(3,196 reviews)
Fit TendencyTrue to Size
Width ProfileStandard (Medium)
View Full Wool Runner Breakdown
Shoe Bmen
Brooks Addiction Walker 2
4.1(3,271 reviews)
Fit TendencyTrue to Size
Width ProfileStandard (Medium)
View Full Addiction Walker 2 Breakdown
Fit Verdict

True to Size Comparison

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

Length Delta+0.24 mm
Width Delta-0.27 mm

Interactive Size Converter

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

Recommended Size in Brooks Addiction Walker 2
US 8.597% Match

Internal shoe cavity difference: +0.2 mm (slightly roomier)

Complete Size Conversion Matrix

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

Wool Runner (US)Internal CavityAddiction Walker 2 EquivalentMatch AccuracyFit Difference
US 3.5239 mmUS 70%+27.2 mm
US 4242 mmUS 70%+24.2 mm
US 4.5246 mmUS 70%+20.2 mm
US 5249 mmUS 70%+17.2 mm
US 5.5252 mmUS 70%+14.2 mm
US 6256 mmUS 70%+10.2 mm
US 6.5259 mmUS 714%+7.2 mm
US 7266 mmUS 797%+0.2 mm
US 7.5269 mmUS 7.597%+0.2 mm
US 8272 mmUS 897%+0.2 mm
US 8.5276 mmUS 8.597%+0.2 mm
US 9279 mmUS 997%+0.2 mm
US 9.5282 mmUS 9.597%+0.2 mm
US 10286 mmUS 1097%+0.2 mm
US 10.5289 mmUS 10.597%+0.2 mm
US 11292 mmUS 1197%+0.2 mm
US 11.5296 mmUS 11.597%+0.2 mm
US 12299 mmUS 1297%+0.2 mm
US 12.5302 mmUS 12.597%+0.2 mm
US 13306 mmUS 1397%+0.2 mm
US 14312 mmUS 1497%+0.2 mm

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Frequently Asked Questions

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

Both shoes share a very similar length profile. We recommend ordering your standard size in both. The Wool Runner has an internal fit offset of -0.68mm compared to -0.44mm for the Addiction Walker 2.

Do these shoes fit wide feet comfortably?

The Wool Runner has a standard medium width profile, while the Addiction Walker 2 is snug/narrow.