The Fastwitch is your speediest race day option if you're looking for a sock-like fit, a touch of stability and ultimate traction on the road. OVERVIEW The first shoe in the Saucony line to use our brand new PowerTrac outsole rubber, with three times the traction compared to normal rubber More responsive midsole SPECS Surface: Road, Track, Cross Country Offset: 4mm Heel Stack Height: 18mm Forefoot Stack Height: 14mm