Almost every component of the Supertech R Boot, Alpinestars definitive racing boot as worn by a roster of champions past & present, has undergone a rigorous program of upgrades to sharpen its performance features even further. Featuring extensive perforations throughout for maximum airflow, innovations derived using feedback from Alpinestars involvement in top flight racing, key elements include a newly redesigned front flex area, a redesigned rear bellow, a redesigned top gaitor, a new shifter & shin plate, a new shin slider & a new inner bootie, all of which enhance the comfort, protection & the performance of this boot to a new class-leading high. Features New TPU stretch panel design with zip for an easier entry & exit & a closer, more optimized fit Hook & loop closure secures the puller zip remains in position Micro adjustable ratchet closure on top of boot for an optimized fit New replaceable heel plate slider design offers increased sliding performance & protection in the case of crash Sole constructed using a lightweight rubber compound for excellent grip on the pegs Separate, internally updated bio-mechanical inner bootie made by 3D mesh material for greater structure, thus improving rider comfort Main upper material constructed using microfiber with a dedicated laser perforation zone for optimum breathability & abrasion resistance, while also delivering high levels of flexibility New front flex area for enhanced impact abrasion while also ensuring the natural front & back New front flex area increases ventilation & airflow for additional breathability Redesigned rear bellow in stretch microfiber for enhanced natural front & back movement Redesigned top gaiter in microfiber material with TPU over injection for enhanced prehensility New synthetic microfiber panel on medial side for enhanced abrasion resistance & enhanced feeling when in contact with the bike Inner bootie is equipped with a new external toe area with a soft TPU reinforcement for superior impact protection & additional ankle padding for greater protection, stability & cushioning during natural movement of the foot Replaceable co-injected TPU/aluminum toe slider with an easy screw system that protects the toe area against abrasion resistance New TPU shifter for increased protection on lower medial side New TPU shin plate has been redesigned for greater impact absorption performance, thus improving abrasion resistance in a key area New replaceable shin slider for additional abrasion resistance The following standards apply to this product EN13634:2017