True-to-Size Millimeter Sizing Comparison

Allbirds Wool Runner vs New Balance Fresh Foam Arishi v4

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 TendencyRuns Small (-4mm)
Width ProfileStandard (Medium)
View Full Wool Runner Breakdown
Shoe Bwomen
New Balance Fresh Foam Arishi v4
4.3(1,394 reviews)
Fit TendencyRuns Small (-4mm)
Width ProfileStandard (Medium)
View Full Fresh Foam Arishi v4 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 Wool Runner to see your calculated size in the Fresh Foam Arishi v4.

Recommended Size in New Balance Fresh Foam Arishi v4
US 10.5100% Match

Internal shoe cavity difference: 0.0 mm (snugger)

Complete Size Conversion Matrix

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

Wool Runner (US)Internal CavityFresh Foam Arishi v4 EquivalentMatch AccuracyFit Difference
US 3.5236 mmUS 5.5100%0.0 mm
US 4239 mmUS 6100%0.0 mm
US 4.5243 mmUS 6.5100%0.0 mm
US 5246 mmUS 7100%0.0 mm
US 5.5249 mmUS 7.5100%0.0 mm
US 6253 mmUS 8100%0.0 mm
US 6.5256 mmUS 8.5100%0.0 mm
US 7263 mmUS 9100%0.0 mm
US 7.5266 mmUS 9.5100%0.0 mm
US 8269 mmUS 10100%0.0 mm
US 8.5273 mmUS 10.5100%0.0 mm
US 9276 mmUS 11100%0.0 mm
US 9.5279 mmUS 1165%-3.0 mm
US 10283 mmUS 1117%-7.0 mm
US 10.5286 mmUS 110%-10.0 mm
US 11289 mmUS 110%-13.0 mm
US 11.5293 mmUS 110%-17.0 mm
US 12296 mmUS 110%-20.0 mm
US 12.5299 mmUS 110%-23.0 mm
US 13303 mmUS 110%-27.0 mm
US 14309 mmUS 110%-33.0 mm

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Frequently Asked Questions

How does the Wool Runner size compare to the Fresh Foam Arishi v4?

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 -4mm compared to -4mm for the Fresh Foam Arishi v4.

Do these shoes fit wide feet comfortably?

The Wool Runner has a standard medium width profile, while the Fresh Foam Arishi v4 is standard medium.