S (23-24.5cm) M (25.0-26.5cm) Brand: TALLMAN Product Features: Growth Support Material: Cushioning Material Features: Growth Support Unit Count: 1.00 set About this product: 【3 Patented Technologies】Cuboid Balance Theory, CCLP Theory, and Ashitore Theory patented technologies. It approaches posture from the feet, supporting children's growth. 【Shoes to Use】You can use it with any shoes, such as general shoes and boots, not sandals. Many people use them for indoor shoes at school, and the longer you use them, the more effective they are expected to be. 【Care Instructions】When not in use, dry them in the shade. If they get dirty, hand wash them with water or a mild detergent and dry them in a well-ventilated place away from direct sunlight.