adidas Boost (white) depicted in the midsole of Adidas NMD R1 shoes
Boost is a material branded and used by Adidas, in the form of pellets which are compressed and molded for various shoes the company creates. The pellets consist of proprietary thermoplastic urethane that are extruded and/or molded into a small pill shape. Adidas collaborated with the German company BASF to create this material. However, Boost in itself is not a raw material and is obtained by processing Thermoplastic Urethane as explained above.  This material is claimed to be extremely comfortable on the wearer's feet.