True-to-Size Millimeter Sizing Comparison
Dr. Martens 2976 Chelsea 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 2976 Chelsea 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.
| 2976 Chelsea (US) | Internal Cavity | THERMOBALL Traction Bootie Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 4.5 | 233 mm | US 3.5 | 14% | +7.2 mm |
| US 5 | 237 mm | US 3.5 | 62% | +3.2 mm |
| US 5.5 | 240 mm | US 3.5 | 97% | +0.2 mm |
| US 6 | 243 mm | US 4 | 97% | +0.2 mm |
| US 6.5 | 247 mm | US 4.5 | 97% | +0.2 mm |
| US 7 | 250 mm | US 5 | 97% | +0.2 mm |
| US 7.5 | 253 mm | US 5.5 | 97% | +0.2 mm |
| US 8 | 257 mm | US 6 | 97% | +0.2 mm |
| US 8.5 | 260 mm | US 6.5 | 97% | +0.2 mm |
| US 9 | 267 mm | US 7 | 97% | +0.2 mm |
| US 9.5 | 270 mm | US 7.5 | 97% | +0.2 mm |
| US 10 | 273 mm | US 8 | 97% | +0.2 mm |
| US 10.5 | 277 mm | US 8.5 | 97% | +0.2 mm |
| US 11 | 280 mm | US 9 | 97% | +0.2 mm |
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Frequently Asked Questions
How does the 2976 Chelsea size compare to the THERMOBALL Traction Bootie?
Both shoes share a very similar length profile. We recommend ordering your standard size in both. The 2976 Chelsea has an internal fit offset of -0.08mm compared to 0.16mm for the THERMOBALL Traction Bootie.
Do these shoes fit wide feet comfortably?
The 2976 Chelsea has a snug/narrow width profile, while the THERMOBALL Traction Bootie is roomy/wide.