As the name implies, TPU foamed material is a product foamed by TPU (thermoplastic polyurethane elastomer), commonly known as "popcorn". Generally, it can be divided into physical foaming and chemical foaming. Physical foaming refers to compressing gas into raw materials and foamed products by changing pressure and temperature without chemical reaction, so it is an environmentally friendly material. Chemical foaming refers to the chemical change of chemical foaming agent when heated, which decomposes to produce gas and promotes the foaming of rubber-plastic polymer. The foaming ratio of TPU foaming material can be as high as 8 times; Non-toxic and tasteless, degradable and more environmentally friendly; It has high strength, heat resistance and wear resistance; Shock absorption, light and comfortable, high resilience, antibacterial and breathable.

Adidas popcorn sneaker Energy Boost is made of E-TPU material developed by BASF, an internationally renowned chemical company. As far as I know, "popcorn" is relatively stable in China now, and it seems that there is a unit called Green Mobil in Ningbo that is doing better.