Constructed with a STRUNG upper, a textile innovation that transforms athlete data into a dynamic material tuned to the athlete's needs, the adidas by Stella McCartney Prime X 2 Strung offers more performance-driven features in a single race shoe. The sneakers have three layers of LIGHTSTRIKE PRO with an all-new energy core between them, helping to reduce weight and provide spring in the fore- and midfoot, so you can beat your PB with ease.