True-to-Size Millimeter Sizing Comparison
Avenger Work Boots Breaker CT vs Avenger Work Boots Foundation CT
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 Breaker CT to see your calculated size in the Foundation CT.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| Breaker CT (US) | Internal Cavity | Foundation CT Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 3.5 | 236 mm | US 4.5 | 88% | +1.0 mm |
| US 4 | 239 mm | US 4.5 | 76% | -2.0 mm |
| US 4.5 | 243 mm | US 5.5 | 88% | +1.0 mm |
| US 5 | 246 mm | US 6 | 88% | +1.0 mm |
| US 5.5 | 249 mm | US 6 | 76% | -2.0 mm |
| US 6 | 253 mm | US 7 | 88% | +1.0 mm |
| US 6.5 | 256 mm | US 7.5 | 88% | +1.0 mm |
| US 7 | 263 mm | US 8.5 | 88% | +1.0 mm |
| US 7.5 | 266 mm | US 8.5 | 76% | -2.0 mm |
| US 8 | 269 mm | US 9 | 76% | +2.0 mm |
| US 8.5 | 273 mm | US 9.5 | 88% | +1.0 mm |
| US 9 | 276 mm | US 10 | 88% | +1.0 mm |
| US 9.5 | 279 mm | US 10 | 76% | -2.0 mm |
| US 10 | 283 mm | US 11 | 88% | +1.0 mm |
| US 10.5 | 286 mm | US 11 | 76% | -2.0 mm |
| US 11 | 289 mm | US 11 | 41% | -5.0 mm |
| US 11.5 | 293 mm | US 11 | 0% | -9.0 mm |
| US 12 | 296 mm | US 11 | 0% | -12.0 mm |
| US 12.5 | 299 mm | US 11 | 0% | -15.0 mm |
| US 13 | 303 mm | US 11 | 0% | -19.0 mm |
| US 14 | 309 mm | US 11 | 0% | -25.0 mm |
Related Comparisons
Frequently Asked Questions
How does the Breaker CT size compare to the Foundation CT?
The Foundation CT provides about 8mm more internal length than the Breaker CT. We suggest ordering 1 full size down in Foundation CT. The Breaker CT has an internal fit offset of -4mm compared to 4mm for the Foundation CT.
Do these shoes fit wide feet comfortably?
The Breaker CT has a standard medium width profile, while the Foundation CT is standard medium.