Our pro triathletes demanded ultimate ventilation & faster transitions so we developed the Trivent Expert with performance-enhancing tri-specific features temperature-regulating construction & Body Geometry ergonomics.FACT carbon/glass fibre reinforced outsole is directionally rigid for outstanding power transfer: 8.5 stiffness index Performance-enhancing Body Geometry contours in the outsole Ergonomic Body Geometry footbed is fully perforated for ventilation & drainage Thermobonded construction for a smooth internal lining for "sockless" riding fit & comfort Chromed fibres of our FACT carbon outsole act as a heat shield deflecting road heat even in the hottest riding conditions Large heel pull for easy entry & faster shoe changes in transitions Arch mounted Launch Clip for flying starts 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 & Speedplay