Thank you for viewing! The height difference structure, with a higher outer side and a lower inner side, corrects bad walking habits that cause bow-legged walking. Using the insole naturally encourages the knees to turn inward, and the effect of keeping the center of gravity inward strengthens the inner muscles of the legs, bringing the knees inward and leading to O-leg improvement. 【High-Quality Materials】Selected mesh fabric is used, with excellent breathability and sweat absorption, providing comfort and durability. It doesn't get stuffy even when worn for long periods, achieving high breathability and quick-drying properties. Adjustable size. M (24~25.5cm) Can be easily cut with scissors you have at home, and the size can be finely adjusted to fit your shoes. 【Unisex】This insole is useful in various situations such as commuting, standing work, running, mountain climbing, and outdoor activities. 58-16