True-to-Size Millimeter Sizing Comparison
Ariat Ariat Rambler vs The North Face THERMOBALL Traction Bootie
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 Ariat Rambler to see your calculated size in the THERMOBALL Traction Bootie.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| Ariat Rambler (US) | Internal Cavity | THERMOBALL Traction Bootie Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 7 | 268 mm | US 7 | 88% | -1.0 mm |
| US 7.5 | 271 mm | US 7.5 | 88% | -1.0 mm |
| US 8 | 274 mm | US 8 | 88% | -1.0 mm |
| US 8.5 | 278 mm | US 8.5 | 88% | -1.0 mm |
| US 9 | 281 mm | US 9 | 88% | -1.0 mm |
| US 9.5 | 284 mm | US 9.5 | 88% | -1.0 mm |
| US 10 | 288 mm | US 10 | 88% | -1.0 mm |
| US 10.5 | 291 mm | US 10.5 | 88% | -1.0 mm |
| US 11 | 294 mm | US 11 | 88% | -1.0 mm |
| US 11.5 | 298 mm | US 11.5 | 88% | -1.0 mm |
| US 12 | 301 mm | US 12 | 88% | -1.0 mm |
| US 12.5 | 304 mm | US 12.5 | 88% | -1.0 mm |
| US 13 | 308 mm | US 13 | 88% | -1.0 mm |
| US 14 | 314 mm | US 14 | 88% | -1.0 mm |
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Frequently Asked Questions
How does the Ariat Rambler size compare to the THERMOBALL Traction Bootie?
Both shoes share a very similar length profile. We recommend ordering your standard size in both. The Ariat Rambler has an internal fit offset of 1.16mm compared to 0.16mm for the THERMOBALL Traction Bootie.
Do these shoes fit wide feet comfortably?
The Ariat Rambler has a snug/narrow width profile, while the THERMOBALL Traction Bootie is roomy/wide.