"White size 21 shoes have an inner length of about 14cm"BREATHABLE: Our toddler shoes for boys and girls are extremely lightweight and stylish. These kids tennis shoes are made of mesh for great breathability and quick dryingLIGHTWEIGHT AND COMFORTABLE: These toddler boys summer sneakers are ultra-light and flexible, providing great freedom and comfort when your child is playing on the playground or outsideCONVENIENT: These toddler tennis shoes for girls feature a hook-and-loop closure for easy on and off, helping kids put on the shoes by themselves more easily and quicklyOccasion: This toddler walking shoe is suitable for boys and girls. Great for leisure, travel, tennis, walking, hiking, playing, dancing, jogging, running sports