True-to-Size Millimeter Sizing Comparison

Ariat Heritage Western R-toe vs Ariat Terrain H2O

Detailed size conversion chart, cavity measurements in millimeters, and crowd-sourced fit advice for choosing your perfect size.

Shoe Aunisex
Ariat Heritage Western R-toe
5.0(5,819 reviews)
Fit TendencyTrue to Size
Width ProfileStandard (Medium)
View Full Heritage Western R-toe Breakdown
Shoe Bwomen
Ariat Terrain H2O
5.0(6,022 reviews)
Fit TendencyRuns Large (+4mm)
Width ProfileStandard (Medium)
View Full Terrain H2O Breakdown
Fit Verdict

Terrain H2O Runs Slightly Larger

The Terrain H2O provides about 4mm more internal length than the Heritage Western R-toe. We suggest ordering 1/2 size down in Terrain H2O.

Length Delta+4 mm
Width DeltaIdentical

Interactive Size Converter

Select what size you wear in the Heritage Western R-toe to see your calculated size in the Terrain H2O.

Recommended Size in Ariat Terrain H2O
US 10100% Match

Internal shoe cavity difference: 0.0 mm (snugger)

Complete Size Conversion Matrix

Direct millimeter-calibrated mapping comparing all available sizes between both shoes.

Heritage Western R-toe (US)Internal CavityTerrain H2O EquivalentMatch AccuracyFit Difference
US 3.5240 mmUS 588%+1.0 mm
US 4243 mmUS 5.588%+1.0 mm
US 4.5247 mmUS 6100%0.0 mm
US 5250 mmUS 6.588%+1.0 mm
US 5.5253 mmUS 788%+1.0 mm
US 6257 mmUS 7.5100%0.0 mm
US 6.5260 mmUS 888%+1.0 mm
US 7267 mmUS 8.565%-3.0 mm
US 7.5270 mmUS 988%+1.0 mm
US 8273 mmUS 9.588%+1.0 mm
US 8.5277 mmUS 10100%0.0 mm
US 9280 mmUS 10.588%+1.0 mm
US 9.5283 mmUS 1188%+1.0 mm
US 10287 mmUS 1165%-3.0 mm
US 10.5290 mmUS 1129%-6.0 mm
US 11293 mmUS 110%-9.0 mm
US 11.5297 mmUS 110%-13.0 mm
US 12300 mmUS 110%-16.0 mm
US 12.5303 mmUS 110%-19.0 mm
US 13307 mmUS 110%-23.0 mm
US 14313 mmUS 110%-29.0 mm

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Frequently Asked Questions

How does the Heritage Western R-toe size compare to the Terrain H2O?

The Terrain H2O provides about 4mm more internal length than the Heritage Western R-toe. We suggest ordering 1/2 size down in Terrain H2O. The Heritage Western R-toe has an internal fit offset of 0mm compared to 4mm for the Terrain H2O.

Do these shoes fit wide feet comfortably?

The Heritage Western R-toe has a standard medium width profile, while the Terrain H2O is standard medium.