True-to-Size Millimeter Sizing Comparison

Ryka Echo Knit Slip On Sneaker vs Ryka Hydro Sport Water Shoes

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

Shoe Awomen
Ryka Echo Knit Slip On Sneaker
4.9(2,689 reviews)
Fit TendencyTrue to Size
Width ProfileStandard (Medium)
View Full Echo Knit Slip On Sneaker Breakdown
Shoe Bunisex
Ryka Hydro Sport Water Shoes
4.5(820 reviews)
Fit TendencyTrue to Size
Width ProfileStandard (Medium)
View Full Hydro Sport Water Shoes Breakdown
Fit Verdict

True to Size Comparison

Both shoes share a very similar length profile. We recommend ordering your standard size in both.

Length Delta0 mm
Width DeltaIdentical

Interactive Size Converter

Select what size you wear in the Echo Knit Slip On Sneaker to see your calculated size in the Hydro Sport Water Shoes.

Recommended Size in Ryka Hydro Sport Water Shoes
US 6100% Match

Internal shoe cavity difference: 0.0 mm (snugger)

Complete Size Conversion Matrix

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

Echo Knit Slip On Sneaker (US)Internal CavityHydro Sport Water Shoes EquivalentMatch AccuracyFit Difference
US 4.5233 mmUS 3.517%+7.0 mm
US 5237 mmUS 3.565%+3.0 mm
US 5.5240 mmUS 3.5100%0.0 mm
US 6243 mmUS 4100%0.0 mm
US 6.5247 mmUS 4.5100%0.0 mm
US 7250 mmUS 5100%0.0 mm
US 7.5253 mmUS 5.5100%0.0 mm
US 8257 mmUS 6100%0.0 mm
US 8.5260 mmUS 6.5100%0.0 mm
US 9267 mmUS 7100%0.0 mm
US 9.5270 mmUS 7.5100%0.0 mm
US 10273 mmUS 8100%0.0 mm
US 10.5277 mmUS 8.5100%0.0 mm
US 11280 mmUS 9100%0.0 mm

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Frequently Asked Questions

How does the Echo Knit Slip On Sneaker size compare to the Hydro Sport Water Shoes?

Both shoes share a very similar length profile. We recommend ordering your standard size in both. The Echo Knit Slip On Sneaker has an internal fit offset of 0mm compared to 0mm for the Hydro Sport Water Shoes.

Do these shoes fit wide feet comfortably?

The Echo Knit Slip On Sneaker has a standard medium width profile, while the Hydro Sport Water Shoes is standard medium.