Built without the constraints of world race regulations, the adidas Adizero Prime X 2 Strung in Core BlackZero Met.Spark offers pinnacle technology, incredible energy return, and enhanced efficiency for your very best races. 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 highperformance compound offers smooth, flexible traction. It breaks all the rules and thats a good thing, giving you the advantage over the other starters, this powerhouse of a shoe can drive you to new heights. Weight 315g Stack height 50 43.5mm Offset 6.5mm Regular fit Lace closure STRUNG upper Textile lining Lightstrike Pro cushioning Dual Carbon infused plates Continental rubber outsole THE HIGH-STACKED RACE SHOE PACKED WITH PERFORMANCE-DRIVEN FEATURES. Built with innovative technology and designed without the constraints of world race regulations, the Prime X 2 Strung offers more performance-driven features in a single race shoe. It's constructed with a STRUNG upper, a textile innovation that transforms athlete data into a dynamic material tuned to the athlete's needs. Prime X 2 Strung also has 3 layers of LIGHTSTRIKE PRO, in a stack height of 50mm. With an all-new energy core between two layers of foam, it helps to reduce weight and provide spring in the fore- and midfoot, so you can chase your fastest moment. An outsole featuring Continental compound delivers serious grip on a variety of surfaces. STRUNG UPPER The strung upper is meticulously crafted with layered strengthenin; Designed with innovative technology and disregarding the regulatory constraints of global competition, the Prime X 2 Strung is a running shoe built for performance. Elle features a STRUNG upper, a textile innovation that transforms an athlete's data into a dynamic material shaped to meet his or her specific needs. The Prime X 2 Strung also includes 3 layers of LIGHTSTRIKE PRO, creating a sole thickness of 50 mm. With an all-new energy core between two layers of foam, elle reduces weight and ensures excellent dynamism in the forefoot and midfoot, for ever-faster running. The outsole features Continental technology for maximum grip on all surfaces.