True-to-Size Millimeter Sizing Comparison
Haflinger AT Classic Hardsole vs Haflinger GZ Classic Grizzly
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 AT Classic Hardsole to see your calculated size in the GZ Classic Grizzly.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| AT Classic Hardsole (US) | Internal Cavity | GZ Classic Grizzly Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 3.5 | 236 mm | US 3.5 | 5% | +8.0 mm |
| US 4 | 239 mm | US 3.5 | 41% | +5.0 mm |
| US 4.5 | 243 mm | US 3.5 | 88% | +1.0 mm |
| US 5 | 246 mm | US 4 | 88% | +1.0 mm |
| US 5.5 | 249 mm | US 4 | 76% | -2.0 mm |
| US 6 | 253 mm | US 5 | 88% | +1.0 mm |
| US 6.5 | 256 mm | US 5.5 | 88% | +1.0 mm |
| US 7 | 263 mm | US 6.5 | 88% | +1.0 mm |
| US 7.5 | 266 mm | US 6.5 | 76% | -2.0 mm |
| US 8 | 269 mm | US 7 | 76% | +2.0 mm |
| US 8.5 | 273 mm | US 7.5 | 88% | +1.0 mm |
| US 9 | 276 mm | US 8 | 88% | +1.0 mm |
| US 9.5 | 279 mm | US 8 | 76% | -2.0 mm |
| US 10 | 283 mm | US 9 | 88% | +1.0 mm |
| US 10.5 | 286 mm | US 9.5 | 88% | +1.0 mm |
| US 11 | 289 mm | US 9.5 | 76% | -2.0 mm |
| US 11.5 | 293 mm | US 10.5 | 88% | +1.0 mm |
| US 12 | 296 mm | US 11 | 88% | +1.0 mm |
| US 12.5 | 299 mm | US 11 | 76% | -2.0 mm |
| US 13 | 303 mm | US 12 | 88% | +1.0 mm |
| US 14 | 309 mm | US 12.5 | 76% | -2.0 mm |
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Frequently Asked Questions
How does the AT Classic Hardsole size compare to the GZ Classic Grizzly?
The GZ Classic Grizzly provides about 8mm more internal length than the AT Classic Hardsole. We suggest ordering 1 full size down in GZ Classic Grizzly. The AT Classic Hardsole has an internal fit offset of -4mm compared to 4mm for the GZ Classic Grizzly.
Do these shoes fit wide feet comfortably?
The AT Classic Hardsole has a standard medium width profile, while the GZ Classic Grizzly is standard medium.