It is made of high quality textile materials. cotton breathable inner lining is used. it is soft and flexible, supports foot movements and muscle development. it is easy to wear and does not come off. it is produced using materials that pass all tests (carcinogenic substance, phthalate, azo dye). it is recommended to wipe clean with a damp cloth. size chart: size 21: 13.5 cm size 22: 14 cm size 23: 15 cm size 24: 15.50 cm size 25: 16 cm size 26: 17 cm size 27: 17.50 cm Improved version for clearer understanding and better search visibility. Suitable for users seeking detailed and reliable product information.