The structure is like a sponge with many small holes, which is the so-called foaming "bubble". The chemical composition of EVA is: ethylene-vinyl acetate copolymer. Speaking of it, foamed rubber is the earliest cushioning technology of modern sports shoes.

Before the birth of AF 1, the midsole of all sneakers was filled with foamed rubber. It was not until the birth of special cushioning technology such as air cushion that foam rubber retired to the second line and became the support embedded in special cushioning technology units. For example, the general ZOOMAIR is the plastic buried in the cushioning position corresponding to foamed rubber, heel and forefoot.

As the foundation of air cushion technology, extended data has developed into various forms after years of development: full palm, half palm and so on. , not listed here.

Then there is the AIRMAX air cushion, which is a large-capacity air cushion. MAX air cushion also has many forms, including single air chamber and multi-air chamber. The pressure of the inner and outer air chambers is also different, and the pressure on the outer side is large, which highlights the protective role of the support and prevents the ankle varus injury caused by the soft air cushion. The inner air chamber has low air pressure and is mainly responsible for buffering.

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