Alpinestars Supertech R Boots Almost every component of the Supertech R 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 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 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: Synthetic microfiber panel on medial side for enhanced abrasion resistance and improved feeling when in contact with the bike TPU shifter for increased protection on lower medial side. TPU shin plate has been redesigned for greater impact absorption performance, thus improving abrasion resistance in a key area. Replaceable shin slider for additional abrasion resistance. TPU stretch panel design with zip for an easier entry and exit and a closer, more optimized fit. Main upper material constructed using microfiber for optimum abrasion resistance, while also delivering high levels of flexibility. Front flex area for improved impact abrasion while also ensuring the natural front and back. Front flex area increases ventilation and airflow for additional breathability.