True-to-Size Millimeter Sizing Comparison
Ryka Devotion X Walking vs Ryka Hydro Sport Water
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 Devotion X Walking to see your calculated size in the Hydro Sport Water.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| Devotion X Walking (US) | Internal Cavity | Hydro Sport Water Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 4.5 | 233 mm | US 3.5 | 19% | +6.9 mm |
| US 5 | 237 mm | US 3.5 | 66% | +2.9 mm |
| US 5.5 | 240 mm | US 3.5 | 99% | -0.1 mm |
| US 6 | 243 mm | US 4 | 99% | -0.1 mm |
| US 6.5 | 247 mm | US 4.5 | 99% | -0.1 mm |
| US 7 | 250 mm | US 5 | 99% | -0.1 mm |
| US 7.5 | 253 mm | US 5.5 | 99% | -0.1 mm |
| US 8 | 257 mm | US 6 | 99% | -0.1 mm |
| US 8.5 | 260 mm | US 6.5 | 99% | -0.1 mm |
| US 9 | 267 mm | US 7 | 99% | -0.1 mm |
| US 9.5 | 270 mm | US 7.5 | 99% | -0.1 mm |
| US 10 | 273 mm | US 8 | 99% | -0.1 mm |
| US 10.5 | 277 mm | US 8.5 | 99% | -0.1 mm |
| US 11 | 280 mm | US 9 | 99% | -0.1 mm |
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Frequently Asked Questions
How does the Devotion X Walking size compare to the Hydro Sport Water?
Both shoes share a very similar length profile. We recommend ordering your standard size in both. The Devotion X Walking has an internal fit offset of 0.12mm compared to 0mm for the Hydro Sport Water.
Do these shoes fit wide feet comfortably?
The Devotion X Walking has a roomy/wide width profile, while the Hydro Sport Water is roomy/wide.