RUNNER'S BEST FRIENDIf you need to transition seamlessly across multiple surfaces while you’re running, the Fluidflex X.S.R. is for you. The upper features a composite stretch mesh rear bootie, a mesh forefoot, and lock down lace system. The midsole is crafted with deep flex grooves for a soft, resilient, and flexible ride. A highly durable outsole is engineered for optimal traction on and off the road.
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