True-to-Size Millimeter Sizing Comparison

Allbirds Wool Runner vs ASICS Novablast 5

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 Bmen
ASICS Novablast 5
5.0(317 reviews)
Fit TendencyRuns Small (-4mm)
Width ProfileStandard (Medium)
View Full Novablast 5 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 Novablast 5.

Recommended Size in ASICS Novablast 5
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.

Wool Runner (US)Internal CavityNovablast 5 EquivalentMatch AccuracyFit Difference
US 3.5236 mmUS 70%+27.0 mm
US 4239 mmUS 70%+24.0 mm
US 4.5243 mmUS 70%+20.0 mm
US 5246 mmUS 70%+17.0 mm
US 5.5249 mmUS 70%+14.0 mm
US 6253 mmUS 70%+10.0 mm
US 6.5256 mmUS 717%+7.0 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 Wool Runner size compare to the Novablast 5?

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 Novablast 5.

Do these shoes fit wide feet comfortably?

The Wool Runner has a standard medium width profile, while the Novablast 5 is standard medium.