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 = 79.5mm / 3.13 inches

US 9 / EU 41 = 87mm / 3.43 inches

US 12 / EU 43 = 94.5mm / 3.73 inches

How to Find Your Feet Measurements: