Nimble, responsive and dynamic, the TRACER 2 is our lightest road shoe. Good luck finding one with this light with this much cushion anywhere else. We kept everything you loved about the original. In particular, the PRO2Lite dual density midsolem offering superior cushioning in the heel and responsiveness in the forefoot, the sock-like feel, and its unique balance of protection and performance. Add to that a new ultra lightweight upper which features an engineered mesh with a more adaptive forefoot, and TPU overlay for those looking for a performance edge when the going gets fast. The upper is finished with a repeated line pattern inspired by the Doppler effect. Hear them go, go, go...