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Zappos.com is proud to offer the Nike - Free Run+ (Cool Grey/Black-Electric Green-Neutral Grey) - Footwear: Granted, some things in life are free, but nothing compares to the liberating feeling a daily run brings. Just your favorite tunes, the open road and a pair of these Nike Free Run+ shoes on your feet! ; Ideal for the runner who wants the strengthening, injury-prevention and natural gait management benefits associated with barefoot training, but also needs the cushioning, traction and underfoot protection. Upper features: ; Full-bootie construction provides a snug, dynamic and barefoot-like fit while allowing for easy on/off. ; Minimal use of seams and internal layers enhances comfort, with or without socks. ; Expansive use of breathable mesh enhances comfort and ventilation while also providing a more barefoot-like fit and feel. ; One-piece overlay features a laser-etched pattern for lightweight, targeted support that balances the fit, durability and support of a shoe with the dynamic flexibility of the foot. ; An asymmetrical lacing system helps to reduce pressure over the top ridge of the foot for enhanced comfort. ; Built on the QD-39 last for an improved, overall fit. Midsole features: ; Molded sockliner mimics the curvature of the foot for a great fit, enhanced comfort and added support. ; Phylite midsole provide a resilient ride and enough durability to double as an outsole while dramatically reducing overall weight. ; Deep Nike Free sipes molded along the length and width of the midsole enhances flexibility and stability, while retaining traction, underfoot protection and cushioning. ; Sipes across the top of the midsole allow for greater engagement of the toes through propulsion for increased muscle activation and a more barefoot-like experience. ; New, center-of-pressure heel design uses geometry to perceptibly enhance cushioning at contact with no compromise in flexibility or transition. Outsole features: ; Abrasion-resistant BRS 100 carbon-rubber under the highest wear regions of the shoe for enhanced durability. ; Strategically placed segments of solid rubber enhance traction and durability at key wear zones. ; Phylite midsole/outsole features Waffle piston geometry to enhance proprioceptive feedback and add cushioning, while also contributing traction and durability. ; Nike+ ready. (Sensor not included) ; 9.00 oz. ; Product measurements were taken using size 8.5. Please note that measurements may vary by size.