The Fastwitch in its eighth edition lives up to its legacy of speed and a touch of stability. With a lightweight engineered mesh upper offering breathability and support, and a responsive SSL EVA midsole for quick transitions through your gait cycle, you may just want to tie these racing shoes tight before you get your fast on. Overview ? FLEXFILM upper is lightweight and supportive ? Engineered air mesh upper that combines breathability and support ? SSL EVA compression molded midsole for lightweight responsiveness ? PWRTRAC Rubber outsole provides 3x better traction than standard rubber Specs ? Shoe Category: Road Racing ? Pronation: Normal ? Water Resistant: No ? Waterproof: No ? Offset: 4mm ? Heel Stack Height: 18mm ? Forefoot Stack Height: 14mm ? Weight: 5.6 oz. | 159 g.