Brooks - Twitch 2 (Black/Gold) - Women's: This versatile sprint spike is designed for the racer seeking a lightweight shoe for distances up to 400 meters and features 6mm pyramid spikes and wrench. Nylon spike plate new lightweight rigid sprint plate with seven spike receptacles for excellent traction and power at toe-off. Latex crash pad in the heel provides lightweight cushioning from impact. Ultra-thin carbon rubber outsole to maintain durability and traction control without the added weight of normal rubber. Internal support saddle internal arch wrap provides added upper support through the midfoot for a glove-like fit. Shoe weighs 6.3 oz with pins.