Comfi Flat Medium Width:

US 6 / EU 37 = 76.5mm / 3 inches

US 9 / EU 40 = 84mm / 3.3 inches

US 12 / EU 43 = 91.5 mm / 3.6 inches

 

Comfi Flat Wide Width:

US 6 / EU 37 = 94mm / 3 11/16″

US 9 / EU 41 = 103mm / 4 1/16″

US 12 / EU 43 = 113mm / 4 7/16"

How to Find Your Feet Measurements: