Crafted with Adidas' innovative technology, the Prime X 2 Strung pushes the level of racing shoes to a new world. Combining a Strung upper, 3 layers of Lightstrike Pro, and two carbon-infused core plates results in this super bouncy trampoline-like Prime X 2. The innovative use of 3 layers of LIGHTSTRIKE PRO, stacked at 50mm height with an energy core between two foam layers, reduces weight and offers enhanced spring in the fore- and midfoot.