Triple-strength Speedlight 3D sole with a stiffness index of 10.0 The seamless unibody construction of the upper reduces pressure points. 4 breathable mesh inserts and pores on the entire surface ensure optimal ventilation The heat-welded TPU reinforcement in the toe area provides additional protection SLW2 twist lock with extra Velcro fastener: the only twist lock with gradual loosening or complete opening at the simple push of a button
