FITTING: sandals vary so please compare foot length with insole measurements, allowing about 3/8" for wiggle room & growth. This last is a true medium, NOT super wide (consultations always OK): EU 20/ US 4.5 = 5", EU 21/US 5 = 5 1/4", EU 22/US 6 = 5 1/2", EU 23/US 6.5 = 5 3/4", EU 24/US 7 = 6", EU 25/US 8 = 6 1/4", EU 26/US 9 = 6 1/2"