Size: US Men 8 / Women 9/ JP 25 / UK 7.5 Condition : Good Best for race. Ultra cushioning. A tip-of-the-spear product geared for elite runners, the Rocket X 2 has been amplified with a hyper-focus on construction. We’ve remastered the geometry of our propulsive carbon fiber plate, sandwiching it between two layers of a brand-new, ultra-responsive, high-performance foam.