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Zappos.com is proud to offer the Brooks - Twitch S (Slam/Pearlized White/Silver/Black) - Footwear: Speed shoe for doing the business in the 50m to 400m races. ; High-Tec Aerodynamic Shroud construction combines with synthetic overlay materials for lightweight breathability and a fast ride. ; Ultra-thin Carbon Rubber yields an outsole made of a durable rubber compound that is both grippy and lightweight. ; Latex crash pad imparts just enough lightweight shock attenuation. ; Nylon spike plate affords lightweight durability. ; 7-well design (6mm spikes and wrench are included). ; 10.00 oz. ; Product measurements were taken using size 9. Please note that measurements may vary by size.