FACT carbon/glass fiber reinforced outsole is directionally rigid for outstanding power transfer: 8.5 stiffness index. Performance- enhancing BG contours in the outsole. Ergonomic, BG High Performance footbed is fully perforated for ventilation and drainage. Chromed fibers of our FACT carbon outsole act as a heat shield, deflecting road heat even in the hottest riding conditions. Smooth internal lining for "sockless" riding fit and comfort. Large heel pull for easy entry and faster shoe changes in transitions. Arch-mounted webbing loop facilitates pre- mounting shoes in pedals with rubber bands (holding crank arms parallel to ground and shoes flat) for faster transitions. Replaceable heel tread with internally recessed bolts. Supple Micromatrix upper with open-air mesh for maximum ventilation. 3-bolt cleat pattern fits Shimano SPD-SL, Look, Time, and Speedplay. Approximate weight: 285g (1/2 pair #42).