True-to-Size Millimeter Sizing Comparison

Spring Step Happy vs Spring Step Orella

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

Shoe Aunisex
Spring Step Happy
4.0(209 reviews)
Fit TendencyRuns Small (-4mm)
Width ProfileStandard (Medium)
View Full Happy Breakdown
Shoe Bunisex
Spring Step Orella
3.9(206 reviews)
Fit TendencyRuns Small (-4mm)
Width ProfileStandard (Medium)
View Full Orella 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 Happy to see your calculated size in the Orella.

Recommended Size in Spring Step Orella
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.

Happy (US)Internal CavityOrella EquivalentMatch AccuracyFit Difference
US 3.5236 mmUS 3.5100%0.0 mm
US 4239 mmUS 4100%0.0 mm
US 4.5243 mmUS 4.5100%0.0 mm
US 5246 mmUS 5100%0.0 mm
US 5.5249 mmUS 5.5100%0.0 mm
US 6253 mmUS 6100%0.0 mm
US 6.5256 mmUS 6.5100%0.0 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

Related Comparisons

spring-step ComparisonEstella vs HappyView Sizing Comparisonspring-step ComparisonEstella vs OrellaView Sizing Comparison

Frequently Asked Questions

How does the Happy size compare to the Orella?

Both shoes share a very similar length profile. We recommend ordering your standard size in both. The Happy has an internal fit offset of -4mm compared to -4mm for the Orella.

Do these shoes fit wide feet comfortably?

The Happy has a standard medium width profile, while the Orella is standard medium.