Alpinestars ST Vented Boots Microfiber upper with perforated insert on iinstep and rear flex zones. PU shin plate with air intakes provides ventilation. Dual density lateral and medial ankle cups with PU ankle slider. External PU heel counter. Internal toe counter. Injected high modulus polyamide midsole contours to the foot and features a high modulus plastic shank reinforcement. Instep and Achilles flex zones offer superior comfort. Rear reflective insert for improved visibility. Removable anatomic footbed and multi-density EVA padding. Alpinestars exclusive vulcanized rubber compound with slim sole profile. Large adjustable Velcro strap with an inner zip for secure closure and fit. CE certified.