True-to-Size Millimeter Sizing Comparison
Ariat Terrain H2O vs Sam Edelman Penny Leather Riding Boots
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 Terrain H2O to see your calculated size in the Penny Leather Riding Boots.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| Terrain H2O (US) | Internal Cavity | Penny Leather Riding Boots Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 4.5 | 237 mm | US 4 | 76% | +2.0 mm |
| US 5 | 241 mm | US 4.5 | 76% | +2.0 mm |
| US 5.5 | 244 mm | US 5 | 76% | +2.0 mm |
| US 6 | 247 mm | US 5.5 | 76% | +2.0 mm |
| US 6.5 | 251 mm | US 6 | 76% | +2.0 mm |
| US 7 | 254 mm | US 6.5 | 76% | +2.0 mm |
| US 7.5 | 257 mm | US 6.5 | 88% | -1.0 mm |
| US 8 | 261 mm | US 7 | 76% | +2.0 mm |
| US 8.5 | 264 mm | US 7.5 | 76% | +2.0 mm |
| US 9 | 271 mm | US 8.5 | 76% | +2.0 mm |
| US 9.5 | 274 mm | US 9 | 76% | +2.0 mm |
| US 10 | 277 mm | US 9.5 | 76% | +2.0 mm |
| US 10.5 | 281 mm | US 10 | 76% | +2.0 mm |
| US 11 | 284 mm | US 10.5 | 76% | +2.0 mm |
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Frequently Asked Questions
How does the Terrain H2O size compare to the Penny Leather Riding Boots?
The Penny Leather Riding Boots is about 8mm shorter than the Terrain H2O. We suggest ordering 1 full size up in Penny Leather Riding Boots. The Terrain H2O has an internal fit offset of 4mm compared to -4mm for the Penny Leather Riding Boots.
Do these shoes fit wide feet comfortably?
The Terrain H2O has a standard medium width profile, while the Penny Leather Riding Boots is snug/narrow.