True-to-Size Millimeter Sizing Comparison
Reebok Classic Nylon vs Reef Fanning
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 Nylon to see your calculated size in the Fanning.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| Classic Nylon (US) | Internal Cavity | Fanning Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 7 | 263 mm | US 6.5 | 65% | -3.0 mm |
| US 7.5 | 266 mm | US 7 | 88% | +1.0 mm |
| US 8 | 269 mm | US 7.5 | 88% | +1.0 mm |
| US 8.5 | 273 mm | US 8 | 100% | 0.0 mm |
| US 9 | 276 mm | US 8.5 | 88% | +1.0 mm |
| US 9.5 | 279 mm | US 9 | 88% | +1.0 mm |
| US 10 | 283 mm | US 9.5 | 100% | 0.0 mm |
| US 10.5 | 286 mm | US 10 | 88% | +1.0 mm |
| US 11 | 289 mm | US 10.5 | 88% | +1.0 mm |
| US 11.5 | 293 mm | US 11 | 100% | 0.0 mm |
| US 12 | 296 mm | US 11.5 | 88% | +1.0 mm |
| US 12.5 | 299 mm | US 12 | 88% | +1.0 mm |
| US 13 | 303 mm | US 12.5 | 100% | 0.0 mm |
| US 14 | 309 mm | US 13 | 76% | -2.0 mm |
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Frequently Asked Questions
How does the Classic Nylon size compare to the Fanning?
The Fanning provides about 4mm more internal length than the Classic Nylon. We suggest ordering 1/2 size down in Fanning. The Classic Nylon has an internal fit offset of -4mm compared to 0mm for the Fanning.
Do these shoes fit wide feet comfortably?
The Classic Nylon has a standard medium width profile, while the Fanning is standard medium.