True-to-Size Millimeter Sizing Comparison
KEEN Newport H2 vs KEEN Whisper
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 Newport H2 to see your calculated size in the Whisper.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| Newport H2 (US) | Internal Cavity | Whisper Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 4.5 | 229 mm | US 3.5 | 0% | +11.0 mm |
| US 5 | 233 mm | US 3.5 | 17% | +7.0 mm |
| US 5.5 | 236 mm | US 3.5 | 53% | +4.0 mm |
| US 6 | 239 mm | US 3.5 | 88% | +1.0 mm |
| US 6.5 | 243 mm | US 4 | 100% | 0.0 mm |
| US 7 | 246 mm | US 4.5 | 88% | +1.0 mm |
| US 7.5 | 249 mm | US 5 | 88% | +1.0 mm |
| US 8 | 253 mm | US 5.5 | 100% | 0.0 mm |
| US 8.5 | 256 mm | US 6 | 88% | +1.0 mm |
| US 9 | 263 mm | US 6.5 | 65% | -3.0 mm |
| US 9.5 | 266 mm | US 7 | 88% | +1.0 mm |
| US 10 | 269 mm | US 7.5 | 88% | +1.0 mm |
| US 10.5 | 273 mm | US 8 | 100% | 0.0 mm |
| US 11 | 276 mm | US 8.5 | 88% | +1.0 mm |
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Frequently Asked Questions
How does the Newport H2 size compare to the Whisper?
The Whisper provides about 4mm more internal length than the Newport H2. We suggest ordering 1/2 size down in Whisper. The Newport H2 has an internal fit offset of -4mm compared to 0mm for the Whisper.
Do these shoes fit wide feet comfortably?
The Newport H2 has a standard medium width profile, while the Whisper is standard medium.