Synthetic soleBREATHABLE UPPER: Allover ventilation breathable holes for drain water quickly and reduce odor, which allows your child to get in touch with water, grass and other natural things.ULTRA LIGHTWEIGHT: Like socks, super lightweight and flexible, only 0.4-0.5lb weight make you feel great freedom and comfortable in wearing.ANTI-SLIP & DURABLE SOLE: The anti-slip EVA sole add more secure traction, with an ergonomically molded, shock absorption performance cushioning separated protective toe guard. Intimate design gives you sufficient protection. Perfect for run, jump, and play.SOFT & FLEXIBLE: This pair of casual shoes is soft and flexible, so we put it in a small plastic bag. You can put it in your bag when you go out or after using it. It doesn't take up too much space at all.Sizing TipsEU SIZE 26 Feet Length 16.5 cmEU SIZE 27 Feet Length 17.0 cmEU SIZE 28 Feet Length 17.6 cmEU SIZE 29 Feet Length 18.3 cmEU SIZE 30 Feet Length 19.0 cmEU SIZE 31 Feet Length 19.7 cmEU SIZE 32 Feet Length 20.4 cmEU SIZE 33 Feet Length 21.1 cmEU SIZE 34 Feet Length 21.8 cmEU SIZE 35 Feet Length 22.5 cm