The shoes are secured with Velcro. There is a delicate layer of wool inside. This is a practical model suitable for children. The shoe features a comfortable 3-centimeter sole to enhance walking comfort and isolate the feet from the cold ground. Carefully crafted, comfortableExecution:Color: Black/Pink/Grey/YellowFixing method: VelcroSole height approximately 3 centimetersSize chart (cm):30 - inner length 19.3 cm31 - inner length 20 cm32 - inner length 20.7 cm33 - inner length 21.3 cm34 - inner length 22.0 cm35 - inner length 22.5 cm36 - inner length 23.0 cm37 - inner length 23.5 cm38 - inner length 24.0 cm