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 | 232 mm | US 3.5 | 9% | +7.7 mm |
| US 5 | 236 mm | US 3.5 | 57% | +3.7 mm |
| US 5.5 | 239 mm | US 3.5 | 92% | +0.7 mm |
| US 6 | 242 mm | US 4 | 92% | +0.7 mm |
| US 6.5 | 246 mm | US 4.5 | 92% | +0.7 mm |
| US 7 | 249 mm | US 5 | 92% | +0.7 mm |
| US 7.5 | 252 mm | US 5.5 | 92% | +0.7 mm |
| US 8 | 256 mm | US 6 | 92% | +0.7 mm |
| US 8.5 | 259 mm | US 6.5 | 92% | +0.7 mm |
| US 9 | 266 mm | US 7 | 92% | +0.7 mm |
| US 9.5 | 269 mm | US 7.5 | 92% | +0.7 mm |
| US 10 | 272 mm | US 8 | 92% | +0.7 mm |
| US 10.5 | 276 mm | US 8.5 | 92% | +0.7 mm |
| US 11 | 279 mm | US 9 | 92% | +0.7 mm |
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Frequently Asked Questions
How does the Newport H2 size compare to the Whisper?
Both shoes share a very similar length profile. We recommend ordering your standard size in both. The Newport H2 has an internal fit offset of -1.08mm compared to -0.4mm for the Whisper.
Do these shoes fit wide feet comfortably?
The Newport H2 has a roomy/wide width profile, while the Whisper is snug/narrow.