Built using sophisticated technology this runner by Brooks inspires loyalty.Microfiber and air mesh upper for lightweight supportUltimate Sockliner with Implus(R) for durable full length cushioningHeel and forefoot Hydroflow(R) cushioning system for optimal shock absorption and energy returnDiagonal Rollbar(R) stabilized midsole minimizes pronationHigh density carbon rubber outsoleWeight: 14.5 oz.
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