The Razer 2 has an XC10 sole with a stiffness index of 10.0. The unit has the seamless Unibod construction that reduces pressure points. 4 ventilating mesh inserts and pores over the entire surface of the shoe to ensure optimal ventilation. Heat-welded TPU reinforcement in the toe and heel area for extra protection. The SLW3 buckle plus extra strap: the single loop with gradual release or complete opening in a single button. Performance Regular sole for better support under the foot.