The adidas Adizero Prime X 2 Strung uses a huge stack of Lightstrike Pro foam for lightweight, responsive cushioning and energy return. Sandwiched within, dual carbon infused plates guide your feet through the transition and offer a pop of energy that can help tired legs make the most of long races. The STRUNG upper allows adidas to build your support layer by layer, with expansion zones throughout the forefoot and a locked in fit through the midfoot and heel. The knitted tongue construction enhances comfort. Underfoot a new, even lighter Continental rubber outsole ensures traction in the dry and wet alike, the high-performance compound offers smooth, flexible traction. It breaks all the rules and that's a good thing, giving you the advantage over the other starters, this powerhouse of a shoe can drive you to new heights.