The sole structure of running shoes can be divided into three levels: outsole, midsole and insole. Among them, the outsole, as the bottom layer of the shoe, comes into direct contact with the ground. Its main function is to provide anti-slip and wear-resistant properties. This layered design enables the sole to not only meet the basic functions but also be technically optimized according to different sports needs.
The midsole, as the name suggests, is a crucial part located between the insole and the outsole, and is usually made of various foam materials. Its core function lies in buffering, shock absorption and providing rebound force, aiming to reduce the ground impact force on the soles of the feet when they land. It can be said that the design and material selection of the midsole largely determine the comfort and performance of a pair of running shoes.
The insole, also known as the insole, has the core function of absorbing sweat and inhibiting bacterial growth. In high-end running shoes, the insole often incorporates advanced technologies, such as shock-absorbing designs, aiming to ensure wearing comfort while enhancing shock absorption. In terms of materials, PU material is a commonly used choice.
