Dili sandals by Kuling. The sandals have a faux leather upper. They have closed toe, a velcro closure for easy on and off, a cushioned insole and a non-slip sole. – Upper: Other Materials.– Lining: Other Materials.– Sole: Other Materials.– Please note that when you purchase shoes for your child, you should select a size that is 1.5 cm larger than your child's foot. Wellies and boots should be up to 2 cm larger, for extra socks and insoles.Size Guide (Insole): 20 = 120 mm 21 = 128 mm 22 = 135 mm 23 = 140 mm 24 = 148 mm 25 = 154 mm 26 = 161 mm 27 = 169 mm 28 = 173 mm