Anatomically engineered for an optimized women*s fit, Rear flex bellow is equipped with a flex window, which also acts as an air intake for effective ventilation and airflow, New ergonomic TPU shift pad for enhanced durability in a critical area, Main upper constructed from an advanced microfiber for comfort, durability and excellent of abrasion resistance, Rear of heel counter has been designed with soft TPR insert which works seamlessly with the rear flex zone to allow for improved freedom of ankle movement and comfort on the bike*s controls, Innovative heel counter support system, which works in conjunction with a strap closure to offer improved fit and support, as well as structural integrity, Extensive perforations throughout for maximum airflow, with a front bellow constructed from textile material for enhanced breathability, Ergonomic boot shaping for forefoot streamlining which offers wide-ranging foot profile fit and comfort, Strap features TPR puller for ease of use, Aramidic fiber wires ensure the new strap closure system is durable, thin and lightweight, Evolved closure strap is anatomically angled to follow natural shape of rider*s instep, Alpinestars exclusive compound rubber sole with grip patterning to promote improved feel and grip, water dispersion and durability, Front Velcro? closure system offers a quick and secure fit over the instep area while permitting excellent levels of flex, Sole features integrated Alpinestars TPF (Transversal protection Frame) to protect against possible transversal loads, Instep and Achilles* accordion flex zones are constructed from lightweight microfiber for optimized levels of durability, comfort and maneuverability on and off the bike, Thermowelded flex grooves to control the flexion and flexibility of the shoe; instep, medial and back, Integrated, replaceable bi-injected TPU forefoot slider features new easy-screw fixing concept for quicker and easier replacement, Reverse zip closure ensures convenient in and out, Double density ankle protector on both sides layered under the upper offers protective performance and abrasion resistance in key area, External, high modulus TPU heel counter, lateral ankle and shift pad for improved shock protection and durability, Internal toe box protection is layered under the upper for durability, improved feel and performance, Removable anatomic foot-bed includes EVA foam and Lycra? for comfort and support, Internal mesh lining for cooling comfort and moisture-wicking