There's fast. And then there's Adizero fast. Designed to help you PB on race day, the Adidas Adizero Prime X running shoes are tuned for speed. Their secret? A game-changing mix of technology, innovation and athlete insight. This shoe has carbon energy rods in the upper midsole then a layer of high performance foam followed by carbon energy blades in the lower midsole (closer to the ground) to maximize the benefit of carbon technology while adding flexibility in the midsole to maintain foot and ankle mobility and health. Product Highlights Made with a series of recycled materials, this upper features at least 50% recycled content Lace closure. Textile upper Lightstrike cushioning ENERGYRODS limit energy loss Rubber outsole Note: this shoe is unisex. Product Details Weight: 8.9oz / 252g Stack: 50mm / 41.5mm Heel Drop: 8.5mm Fit: Fits true to Size Category: Performance / Carbon