The QW-K v4 is built for speed and will give you lots of power for your short distance runs. super lightweight materials. unisex. maximum efficiency and great traction. fits like a sock. The agressive spike plate gives you top speed on every run. The nylon plate inside maximizes the rigidity-to-weight ratio giving you a balanced run. Designed to give you a powerful start to the finish line. Brooks Women's QW-K v4