True-to-Size Millimeter Sizing Comparison

Allbirds Tree 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 Tree Runner
4.7(6,450 reviews)
Fit TendencyTrue to Size
Width ProfileStandard (Medium)
View Full Tree 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

Fresh Foam Arishi v4 Runs Slightly Smaller

The Fresh Foam Arishi v4 is about 4mm shorter than the Tree Runner. We suggest ordering 1/2 size up in Fresh Foam Arishi v4.

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 Fresh Foam Arishi v4.

Recommended Size in New Balance Fresh Foam Arishi v4
US 1188% Match

Internal shoe cavity difference: -1.0 mm (snugger)

Complete Size Conversion Matrix

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

Tree Runner (US)Internal CavityFresh Foam Arishi v4 EquivalentMatch AccuracyFit Difference
US 3.5240 mmUS 688%-1.0 mm
US 4243 mmUS 6.5100%0.0 mm
US 4.5247 mmUS 788%-1.0 mm
US 5250 mmUS 7.588%-1.0 mm
US 5.5253 mmUS 8100%0.0 mm
US 6257 mmUS 8.588%-1.0 mm
US 6.5260 mmUS 965%+3.0 mm
US 7267 mmUS 9.588%-1.0 mm
US 7.5270 mmUS 1088%-1.0 mm
US 8273 mmUS 10.5100%0.0 mm
US 8.5277 mmUS 1188%-1.0 mm
US 9280 mmUS 1153%-4.0 mm
US 9.5283 mmUS 1117%-7.0 mm
US 10287 mmUS 110%-11.0 mm
US 10.5290 mmUS 110%-14.0 mm
US 11293 mmUS 110%-17.0 mm
US 11.5297 mmUS 110%-21.0 mm
US 12300 mmUS 110%-24.0 mm
US 12.5303 mmUS 110%-27.0 mm
US 13307 mmUS 110%-31.0 mm
US 14313 mmUS 110%-37.0 mm

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Frequently Asked Questions

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

The Fresh Foam Arishi v4 is about 4mm shorter than the Tree Runner. We suggest ordering 1/2 size up in Fresh Foam Arishi v4. The Tree Runner has an internal fit offset of 0mm compared to -4mm for the Fresh Foam Arishi v4.

Do these shoes fit wide feet comfortably?

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