FITTING: this sandal runs a little short so please check foot length with insole measurements, allowing 3/8"+ for wiggle room & growth (consultations always OK): Euro 18/US 3 = 4 1/4+", Euro 19/US 4 = 4 1/2+", Euro 20/US 4.5 = 4 3/4+ " (+for just over this measurement)