Racing boots made from highly abrasion resistant microfiber material. Features Breathable mesh textile inner lining Two interchangeable insoles in different thicknesses, Sport Grip for more direct contact & Ortholite® Comfort for more comfort Zipper on the inside Reinforced heel counter Padded TPU shin plate with integrated ventilation opening TPU molded heel, ankle & calf with integrated ventilation opening i XS-Flex Control System made from TPU for increased lateral stability Individual calf width adjustment with Velcro & stretch Replaceable toe sliders made from light metal Padded synthetic inserts on the ankle Soft accordion stretch over instep & at heel for highest comfort Shifter reinforcement made from TPU for best grip Abrasion resistant Vibram rubber sole with shock absorber Safety: meets the EN13634:2017 test standard