True-to-Size Millimeter Sizing Comparison
OOFOS OOahh vs OOFOS OOriginal Thong
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 OOahh to see your calculated size in the OOriginal Thong.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| OOahh (US) | Internal Cavity | OOriginal Thong Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 7 | 267 mm | US 7 | 99% | -0.1 mm |
| US 7.5 | 270 mm | US 7.5 | 99% | -0.1 mm |
| US 8 | 273 mm | US 8 | 99% | -0.1 mm |
| US 8.5 | 277 mm | US 8.5 | 99% | -0.1 mm |
| US 9 | 280 mm | US 9 | 99% | -0.1 mm |
| US 9.5 | 283 mm | US 9.5 | 99% | -0.1 mm |
| US 10 | 287 mm | US 10 | 99% | -0.1 mm |
| US 10.5 | 290 mm | US 10.5 | 99% | -0.1 mm |
| US 11 | 293 mm | US 11 | 99% | -0.1 mm |
| US 11.5 | 297 mm | US 11.5 | 99% | -0.1 mm |
| US 12 | 300 mm | US 12 | 99% | -0.1 mm |
| US 12.5 | 303 mm | US 12.5 | 99% | -0.1 mm |
| US 13 | 307 mm | US 13 | 99% | -0.1 mm |
| US 14 | 313 mm | US 14 | 99% | -0.1 mm |
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Frequently Asked Questions
How does the OOahh size compare to the OOriginal Thong?
Both shoes share a very similar length profile. We recommend ordering your standard size in both. The OOahh has an internal fit offset of 0.16mm compared to 0.08mm for the OOriginal Thong.
Do these shoes fit wide feet comfortably?
The OOahh has a snug/narrow width profile, while the OOriginal Thong is roomy/wide.