True-to-Size Millimeter Sizing Comparison

Allbirds Tree Breezer vs Clarks Breeze Sea

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 Bwomen
Clarks Breeze Sea
5.0(3,256 reviews)
Fit TendencyTrue to Size
Width ProfileStandard (Medium)
View Full Breeze Sea 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-0.15 mm

Interactive Size Converter

Select what size you wear in the Tree Breezer to see your calculated size in the Breeze Sea.

Recommended Size in Clarks Breeze Sea
US 10.597% 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.

Tree Breezer (US)Internal CavityBreeze Sea EquivalentMatch AccuracyFit Difference
US 3.5240 mmUS 5.597%+0.2 mm
US 4243 mmUS 697%+0.2 mm
US 4.5247 mmUS 6.597%+0.2 mm
US 5250 mmUS 797%+0.2 mm
US 5.5253 mmUS 7.597%+0.2 mm
US 6257 mmUS 897%+0.2 mm
US 6.5260 mmUS 8.597%+0.2 mm
US 7267 mmUS 997%+0.2 mm
US 7.5270 mmUS 9.597%+0.2 mm
US 8273 mmUS 1097%+0.2 mm
US 8.5277 mmUS 10.597%+0.2 mm
US 9280 mmUS 1197%+0.2 mm
US 9.5283 mmUS 1167%-2.8 mm
US 10287 mmUS 1120%-6.8 mm
US 10.5290 mmUS 110%-9.8 mm
US 11293 mmUS 110%-12.8 mm
US 11.5297 mmUS 110%-16.8 mm
US 12300 mmUS 110%-19.8 mm
US 12.5303 mmUS 110%-22.8 mm
US 13307 mmUS 110%-26.8 mm
US 14313 mmUS 110%-32.8 mm

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Frequently Asked Questions

How does the Tree Breezer size compare to the Breeze Sea?

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 -0.12mm compared to 0.12mm for the Breeze Sea.

Do these shoes fit wide feet comfortably?

The Tree Breezer has a roomy/wide width profile, while the Breeze Sea is snug/narrow.