If the original adidas adizero Prime X Strung was a rule breaker, then consider the Prime X Strung 2 a rule destroyer. The Prime X Strung 2 features a completely new design to deliver an even more innovative and (more importantly) faster ride than the previous version. While this shoe won't be seen on the feet of the pros at World Athletics sanctioned races due to its many illegal features, it is a fantastic option for the non-pro who wants to experience the most innovative ride that a running shoe can offer. Starting with the midsole, the Prime X Strung 2 not only features the same mind blowing stack height of 50mm in the heel, but now also features a leaf spring carbon plate that has to be seen to be believed. Strategically placed within the leaf spring plate is an incredibly soft and bouncy foam insert in the forefoot called Energy Core. The combination of 50mm of Lightstrike PRO, the carbon leaf spring plate, and Energy Core results in an incredibly springy and energetic ride that makes running faster and farther easier than ever, making the Prime X Strung 2 an easy choice for long runs, race day, and everything in between. In the outsole, this shoe features ultra grippy and durable Continental Rubber in the forefoot and a super sticky and incredibly lightweight textile rubber the rest of the way—a combination that works to deliver maximum traction and high performance in any weather condition. Wrapping this shoe up is the hyper-adaptable strung upper that provides more flex and comfort than the previous version. Overall, the adidas adizero Prime X Strung 2 offers a completely unique look and ride and continues to push the limits of innovation so you can push past your own.What You'll LoveShoe geometry offers excellent stability despite stack heightNew carbon plate with a leaf spring design offers a uniquely high powered ride