ADIZERO PRIME X STRUNG is our first ever Adizero running shoe with a STRUNG upper. STRUNG is a textile innovation that transforms athlete data into a dynamic material tuned to the athlete's needs. It makes it possible to map and program different fiber properties thread by thread. With a flexible and a lightweight seamless cocoon feeling around the foot, STRUNG helps optimize your comfort, and supports you in breaking your personal best on long distance runs. The STRUNG upper is fused to a Prime X outsole packed with carbon ENERGYRODS and three-layers of LIGHTSTRIKE PRO for a responsive run. Brand new in box. Price is firm.