True-to-Size Millimeter Sizing Comparison
Vans Authentic vs Vans Classic Slip-On
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 Authentic to see your calculated size in the Classic Slip-On.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| Authentic (US) | Internal Cavity | Classic Slip-On Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 7 | 260 mm | US 7 | 98% | -0.2 mm |
| US 7.5 | 267 mm | US 7.5 | 98% | -0.2 mm |
| US 8 | 270 mm | US 8 | 98% | -0.2 mm |
| US 8.5 | 273 mm | US 8.5 | 98% | -0.2 mm |
| US 9 | 280 mm | US 9 | 98% | -0.2 mm |
| US 9.5 | 283 mm | US 9.5 | 98% | -0.2 mm |
| US 10 | 287 mm | US 10 | 98% | -0.2 mm |
| US 10.5 | 293 mm | US 10.5 | 98% | -0.2 mm |
| US 11 | 297 mm | US 11 | 98% | -0.2 mm |
| US 11.5 | 300 mm | US 11.5 | 98% | -0.2 mm |
| US 12 | 307 mm | US 12 | 98% | -0.2 mm |
| US 13 | 313 mm | US 13 | 98% | -0.2 mm |
Related Comparisons
vans ComparisonAuthentic vs Classic Slip-On CheckerboardView Sizing Comparisonvans ComparisonAuthentic vs Old SkoolView Sizing ComparisonDirect RivalryStan Smith vs Classic Slip-OnView Sizing ComparisonDirect RivalryGazelle vs Classic Slip-OnView Sizing ComparisonDirect RivalryAir Force 1 '07 vs Classic Slip-OnView Sizing ComparisonDirect RivalryChuck Taylor All Star Low-Top vs Classic Slip-OnView Sizing Comparison
Frequently Asked Questions
How does the Authentic size compare to the Classic Slip-On?
Both shoes share a very similar length profile. We recommend ordering your standard size in both. The Authentic has an internal fit offset of 0.12mm compared to -0.08mm for the Classic Slip-On.
Do these shoes fit wide feet comfortably?
The Authentic has a standard medium width profile, while the Classic Slip-On is snug/narrow.