Northwave Razer 2 MTB Shoes - Black/Ylw FluoXC 10 Sole with a stiffness index of 10. 0. TPU inserts in strategic points ensure high traction and outstanding wear resistance The unibody construction matches strategically placed large mesh inserts with ultrathin reinforced materials to deliver unrivalled breathability and targeted stability The asymmetric lacing removes pressure from the top of the foot for the optimum snug fit TPU thermowelded reinforcements on the toe and heel for added