True-to-Size Millimeter Sizing Comparison
KEEN Utility Cincinnati 6" Waterproof (Carbon Toe) vs KEEN Utility Flint II (Soft Toe)
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 Cincinnati 6" Waterproof (Carbon Toe) to see your calculated size in the Flint II (Soft Toe).
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| Cincinnati 6" Waterproof (Carbon Toe) (US) | Internal Cavity | Flint II (Soft Toe) Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 7 | 267 mm | US 7 | 94% | +0.5 mm |
| US 7.5 | 270 mm | US 7.5 | 94% | +0.5 mm |
| US 8 | 273 mm | US 8 | 94% | +0.5 mm |
| US 8.5 | 277 mm | US 8.5 | 94% | +0.5 mm |
| US 9 | 280 mm | US 9 | 94% | +0.5 mm |
| US 9.5 | 283 mm | US 9.5 | 94% | +0.5 mm |
| US 10 | 287 mm | US 10 | 94% | +0.5 mm |
| US 10.5 | 290 mm | US 10.5 | 94% | +0.5 mm |
| US 11 | 293 mm | US 11 | 94% | +0.5 mm |
| US 11.5 | 297 mm | US 11.5 | 94% | +0.5 mm |
| US 12 | 300 mm | US 12 | 94% | +0.5 mm |
| US 12.5 | 303 mm | US 12.5 | 94% | +0.5 mm |
| US 13 | 307 mm | US 13 | 94% | +0.5 mm |
| US 14 | 313 mm | US 14 | 94% | +0.5 mm |
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Frequently Asked Questions
How does the Cincinnati 6" Waterproof (Carbon Toe) size compare to the Flint II (Soft Toe)?
Both shoes share a very similar length profile. We recommend ordering your standard size in both. The Cincinnati 6" Waterproof (Carbon Toe) has an internal fit offset of -0.24mm compared to 0.24mm for the Flint II (Soft Toe).
Do these shoes fit wide feet comfortably?
The Cincinnati 6" Waterproof (Carbon Toe) has a snug/narrow width profile, while the Flint II (Soft Toe) is roomy/wide.