The T Flex LS 100 features the BOA L4 Technology that weighs up to 23 less than other cycling shoe closures, provides a smooth, no pressure point fit, is an easy, efficient adjustment with one turn of the dial and infinite degrees of fine tuning, and locks onto place. The T Flex Dual Density Outsole is constructed of a dual density PU material that offers both density and traction when needed. The different angles of crampons allow for better mud evacuation. A removable carbon blade provides maximum stiffness when needed and when removed allows for cooling and ventilation. ELITE FIT. BOA L4 single rail quick attach system and forefoot Velcro closure: Quick attach, distributed pressure and ultra light. HRS 100 with 0.6 mm membrane: maintains heel positioning and reduces loss of power from slippageMicrofiber and mesh upper: provides better support through a rigid upper. Polyurethane Lycra inside heel cup: Enhances support of heel. Ice Fil Ergo Air Cool Stuff blue double density EVA and Hot STuff red antibacterial insoles: Patented system fir riding in any weather conditions. Heel reflector : improves visibility. Cleat position indicator compatible with SPD cleats.