True-to-Size Millimeter Sizing Comparison

Allbirds Tree Breezer vs Sperry AO 2 Eye Leather MM

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

Shoe Aunisex
Allbirds Tree Breezer
4.5(3,717 reviews)
Fit TendencyTrue to Size
Width ProfileStandard (Medium)
View Full Tree Breezer Breakdown
Shoe Bunisex
Sperry AO 2 Eye Leather MM
4.0(5,519 reviews)
Fit TendencyTrue to Size
Width ProfileStandard (Medium)
View Full AO 2 Eye Leather MM 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 Tree Breezer to see your calculated size in the AO 2 Eye Leather MM.

Recommended Size in Sperry AO 2 Eye Leather MM
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.

Tree Breezer (US)Internal CavityAO 2 Eye Leather MM EquivalentMatch AccuracyFit Difference
US 3.5240 mmUS 3.5100%0.0 mm
US 4243 mmUS 4100%0.0 mm
US 4.5247 mmUS 4.5100%0.0 mm
US 5250 mmUS 5100%0.0 mm
US 5.5253 mmUS 5.5100%0.0 mm
US 6257 mmUS 6100%0.0 mm
US 6.5260 mmUS 6.5100%0.0 mm
US 7267 mmUS 7100%0.0 mm
US 7.5270 mmUS 7.5100%0.0 mm
US 8273 mmUS 8100%0.0 mm
US 8.5277 mmUS 8.5100%0.0 mm
US 9280 mmUS 9100%0.0 mm
US 9.5283 mmUS 9.5100%0.0 mm
US 10287 mmUS 10100%0.0 mm
US 10.5290 mmUS 10.5100%0.0 mm
US 11293 mmUS 11100%0.0 mm
US 11.5297 mmUS 11.5100%0.0 mm
US 12300 mmUS 12100%0.0 mm
US 12.5303 mmUS 12.5100%0.0 mm
US 13307 mmUS 13100%0.0 mm
US 14313 mmUS 14100%0.0 mm

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Frequently Asked Questions

How does the Tree Breezer size compare to the AO 2 Eye Leather MM?

Both shoes share a very similar length profile. We recommend ordering your standard size in both. The Tree Breezer has an internal fit offset of 0mm compared to 0mm for the AO 2 Eye Leather MM.

Do these shoes fit wide feet comfortably?

The Tree Breezer has a standard medium width profile, while the AO 2 Eye Leather MM is standard medium.