Upper is constructed from a light microfiber that provides flexibility and abrasion resistance Thermoplastic Polyurethane (TPU) shin-plate construction and a reinforced hook-and-loop closure offers a comfortable, highly customized fit TPU blade system provides flexibility while helping prevent frontal hyperextension Wide entry aperture and a hook-and-loop upper closure Thermoplastic Rubber (TPR) flap allows for a broad range of calf fit adjustments for comfort and support Single-piece TPU panel with honeycomb sculpturing for maximum grip contact with bike and improved heat and abrasion resistance on the medial facing area Top rear flexion of the boot is supported around the calf by an innovative TPU sliding blade system helps to dissipate friction Ergonomic buckle system offers secure and highly personalized fit Innovative TPU lateral ankle protection provides biomechanical link between the middle lateral and the bottom lateral of the boot Instep and Achilles accordion flex zones for superior support and control Toes protected by metal shank reinforced TPU shell Microfiber gaiter helps keep out water and dirt Polymer buckles with aluminum frames provide self-aligning, quick-release closures for personalized fit Breathable mesh 3D liner with anti-sliding microfiber suede reinforcement in the heel Shock absorbing soft poly-foam surrounds ankles and collar Removable anatomic footbed High-grip, double-density rubber outer sole is removable and replaceable 3410-1126 - 8 3410-1127 - 9