The Supermono Shoe is certified to FIA homologation standardsMain upper chassis constructed from supple, lightweight kangaroo leather for exceptional levels of comfort and durability. Alpinestars foot counter features multi-compound construction and ergonomic Polypropylene heel counter, which provides support, protection and stability plus integrated PU fireproof heel for comfort. Lightweight micro-porous padding around the heel and insole enhance comfort while driving and walking. All graphic elements are printed for improved weight-saving. Extensive perforation zones on lateral and medial sides, tongue and collar for improved ventilation and breathability and comfort. Tubular lining construction in Nomex® material for excellent levels of heat-resistant, weight-saving and reduced seams to improve all round comfort. Tongue padding made in double layer CarbonX® fabric for additional flame-retardant properties, plus reduced weight. Collar padding constructed from Nitrile Rubber for comfort and weight-saving. Alpinestars exclusive lightweight rubber compound sole with special line textured grip and improved pedal feel in race conditions. FIA /Alpinestars label on the tongue made from fireproof TPR.