The "21" on the sole of the shoe indicates size 21, which is 14cm. 【Excellent Material】Made of a soft, stretchy, and breathable cotton blend, it wicks away sweat effectively, keeping children's feet comfortable even if they sweat easily. 【Non-Slip Sole】The sole is completely covered with a non-slip material, providing better grip on the ground. It is flexible, elastic, and wear-resistant, ensuring durability. 【Design】Cute and simple design with excellent breathability. It doesn't get stuffy even after wearing it for a long time, making it comfortable to wear in summer and spring. It fastens with Velcro, making it easy to put on and take off. 【Applicable Scenes】Suitable not only for indoor wear but also for outings, travel, and walking practice. It's also a great gift for baby showers, children's birthdays, and Children's Day. 【Size】*Please note that there may be a measurement error of 0.1-0.5cm. *As children's body types vary, please check your child's foot size before purchasing. How to choose the size: Foot length + 1cm = Shoe size :..。.:*・・*✳︎✳︎*・・*:.。。:..。.:*・・*✳︎✳︎*・・ ⭐️Brand new, unused ⭐️Instant purchase/no comments necessary ⭐️First come, first served for one-of-a-kind items! ⭐️Please feel free to ask if you have any questions♪ Check out my other items → #yaco's product list l14-16050/5929$$1041 y+