True-to-Size Millimeter Sizing Comparison
The North Face THERMOBALL Traction Bootie vs UGG Classic Short II
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 THERMOBALL Traction Bootie to see your calculated size in the Classic Short II.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| THERMOBALL Traction Bootie (US) | Internal Cavity | Classic Short II Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 3.5 | 240 mm | EU 36 | 98% | -0.2 mm |
| US 4 | 243 mm | EU 37 | 55% | +3.8 mm |
| US 4.5 | 247 mm | EU 37 | 98% | -0.2 mm |
| US 5 | 250 mm | EU 38 | 67% | +2.8 mm |
| US 5.5 | 253 mm | EU 38 | 98% | -0.2 mm |
| US 6 | 257 mm | EU 39 | 67% | +2.8 mm |
| US 6.5 | 260 mm | EU 39 | 98% | -0.2 mm |
| US 7 | 267 mm | EU 40 | 98% | -0.2 mm |
| US 7.5 | 270 mm | EU 41 | 67% | +2.8 mm |
| US 8 | 273 mm | EU 41 | 98% | -0.2 mm |
| US 8.5 | 277 mm | EU 42 | 67% | +2.8 mm |
| US 9 | 280 mm | EU 42 | 98% | -0.2 mm |
| US 9.5 | 283 mm | EU 43 | 55% | +3.8 mm |
| US 10 | 287 mm | EU 43 | 98% | -0.2 mm |
| US 10.5 | 290 mm | EU 44 | 67% | +2.8 mm |
| US 11 | 293 mm | EU 44 | 98% | -0.2 mm |
| US 11.5 | 297 mm | EU 45 | 67% | +2.8 mm |
| US 12 | 300 mm | EU 45 | 98% | -0.2 mm |
| US 12.5 | 303 mm | EU 45 | 62% | -3.2 mm |
| US 13 | 307 mm | EU 45 | 15% | -7.2 mm |
| US 14 | 313 mm | EU 45 | 0% | -13.2 mm |
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Frequently Asked Questions
How does the THERMOBALL Traction Bootie size compare to the Classic Short II?
Both shoes share a very similar length profile. We recommend ordering your standard size in both. The THERMOBALL Traction Bootie has an internal fit offset of 0.16mm compared to -0.04mm for the Classic Short II.
Do these shoes fit wide feet comfortably?
The THERMOBALL Traction Bootie has a roomy/wide width profile, while the Classic Short II is snug/narrow.