Thick insulation in the form of soft fur will nicely wrap your child's feet.When choosing a size, please use the size chart. 19-12,5/20-13/21-13,5/22-14/23-14,5/24-15/25-15,5/26-16,5/27-17/28-17,5/29-18/30-18,9/31-20/32-20,5/33-21/34-22/35-22,5/36-23 cm.