Zappos.com is proud to offer the Nike - Zoom Red Rocks (Anthracite/Metallic Pewter-Black-Citron) - Footwear: This lightweight trail shoe is perfect for the runner who craves a low and responsive ride. ; Sleek and modern upper design with a heel fit system for an adaptive fit and lockdown. ; Full-length Phylon midsole. ; Integrated second midsole featuring forefoot Zoom Air unit for a responsive ride. ; Full-length carbon rubber outsole with aggressive, adaptive traction lug and midsole configuration. ; 10.00 oz. ; Product measurements were taken using size 8.5. Please note that measurements may vary by size.