Alpinestars Supertech R Vented Boots Almost every component of the Supertech R Vented Boot, Alpinestars definitive racing boot as worn by a roster of champions past and 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 include a newly redesigned front flex area, a redesigned rear bellow, a redesigned top gaiter, a new shifter and shin plate, a new shin slider and a new inner bootie, all of which enhance the comfort, protection and the performance of this boot to a new class-leading high. Features: Main upper material constructed using microfiber with a dedicated laser perforation zone Perforation allows for optimum breathability and abrasion resistance, while also delivering high levels of flexibility New front flex area for improved impact abrasion while also ensuring the natural front and back New front flex area increases ventilation and airflow for additional breathability Redesigned rear bellow in stretch microfiber for improved natural front and 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 and improved feeling New TPU shifter for increased protection on lower medial side New TPU shin plate has been redesigned for greater impact absorption performance New replaceable shin slider for additional abrasion resistance New TPU stretch panel design with zip for an easier entry and exit and a closer fit Hook and loop closure secures the puller zip remains in position Micro adjustable ratchet closure on top of boot for an optimized fit Replaceable co-injected TPU/aluminum toe slider with an easy screw system that protects the toe area against abrasion resistance New replaceable heel plate slider design offers increased sliding performance and protection in the case of crash Sole constructed using a lightweight rubber compound for excellent grip on the pegs Separate bio-mechanical inner bootie made by 3D mesh material for greater structure Inner bootie is equipped with a new external toe area with a soft TPU reinforcement for superior impact protection and additional ankle padding Bootie allows for greater protection and stability during natural movement of the foot Meets CE CE EN13634:2017 standards