S9 has carbon plates.

The graphite carbon board uses high-quality graphite carbon material and adds an organic compound with strong acid resistance. It is refined through high-pressure molding, vacuum impregnation, and high-temperature heat treatment processes. It has extraordinary acid resistance and temperature resistance. It is an ideal lining material for phosphoric acid reaction tanks, phosphoric acid storage tanks and other equipment in the chemical industry.

The board is called carbon fiber board. It is a very high-end material, so the cost is definitely more expensive than TPU made of plastic. And this is also a symbol of high-end basketball shoes. The midsoles of James series and Kobe series basketball shoes have carbon plates as big as credit cards.