True-to-Size Millimeter Sizing Comparison
Crocs Classic Clogs vs OOFOS OOahh Slide
Detailed size conversion chart, cavity measurements in millimeters, and crowd-sourced fit advice for choosing your perfect size.
Interactive Size Converter
Select what size you wear in the Classic Clogs to see your calculated size in the OOahh Slide.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| Classic Clogs (US) | Internal Cavity | OOahh Slide Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 7 | 267 mm | US 7 | 100% | 0.0 mm |
| US 7.5 | 270 mm | US 7.5 | 100% | 0.0 mm |
| US 8 | 273 mm | US 8 | 100% | 0.0 mm |
| US 8.5 | 277 mm | US 8.5 | 100% | 0.0 mm |
| US 9 | 280 mm | US 9 | 100% | 0.0 mm |
| US 9.5 | 283 mm | US 9.5 | 100% | 0.0 mm |
| US 10 | 287 mm | US 10 | 100% | 0.0 mm |
| US 10.5 | 290 mm | US 10.5 | 100% | 0.0 mm |
| US 11 | 293 mm | US 11 | 100% | 0.0 mm |
| US 11.5 | 297 mm | US 11.5 | 100% | 0.0 mm |
| US 12 | 300 mm | US 12 | 100% | 0.0 mm |
| US 12.5 | 303 mm | US 12.5 | 100% | 0.0 mm |
| US 13 | 307 mm | US 13 | 100% | 0.0 mm |
| US 14 | 313 mm | US 14 | 100% | 0.0 mm |
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Frequently Asked Questions
How does the Classic Clogs size compare to the OOahh Slide?
Both shoes share a very similar length profile. We recommend ordering your standard size in both. The Classic Clogs has an internal fit offset of 0mm compared to 0mm for the OOahh Slide.
Do these shoes fit wide feet comfortably?
The Classic Clogs has a roomy/wide width profile, while the OOahh Slide is standard medium.