Newly designed boot upper incorporates innovative front, rear bellow, and rear calf zones for superior levels of flexibility. Main upper material constructed from advanced microfiber for durability and repeated abrasion resistance, plus a waterproof and breathable Drystar liner for excellent all-weather performance. Ergonomic last for forefoot streamlining to enable greater control of the bike's controls and for superior, wide-ranging foot profile, fit, and comfort. Alpinestars' innovative TPU lateral ankle brace protection provides a bio-mechanical support between lateral top calf/shin and ankle and offers improved structural integrity, protection against impact shocks, repeated abrasion resistance, and flex support. Air vents on the heel counter and shin plate improve comfort and reduce fatigue on short and long rides. High modulus TPU-injected shin guard, calf protector, heel counter, shift pad, ankle brace, and toe slider for improved shock protection and durability. Double-density ankle protector on medial side layered under the upper offers protective performance in key areas. Integrated, replaceable, bi-injected TPU slider features new screw fixing concept for quicker and easier replacement. Innovative instep and Achilles accordion flex zone construction for superior comfort, extension, control, and support. Internal insole with the shank reinforcement integrated for support to the arch area and foot protection. Medial side entry opening/closure system features elastic-mounted zipper with wide hook-and-loop closure for flexibility and secure fit.