The LIEWOOD River Rain Boot for children is made from 100% natural rubber and available with playful details – perfect for making rainy days much more fun.Material 100% natural rubber Free from harmful chemicals like phthalate, PAH Waterproof Tested for slip resistance on wet and dry surface making sure your child keeps a good grip. Tested for flexing of the sole to guarantee that the soles do not split. Note For the colder days ahead, add an extra wool sole to create warmth and enhance the comfort. Store the rain boots in a dark place without direct sunlight. Size Guide To find the right size for your child, please select the size according to your child’s foot lenght and add some extra space for the foot to grow. However, we recommend that you do not calculate too much room for growth in when determining the correct size for your child. Rain boots are naturally meant to fit a little looser than other shoes, but not too loose as it is not possible to strap the foot in.