The Alpinestars SP v2 Boots main upper is constructed from premium suede for optimum levels of durability, comfort and fit. It was developed with asymmetric lacing system for supportive closure and customized fit plus laser perforations for breathability which are incorporated into an anatomically profiled shoe that also features Alpinestars exclusive ultra-thin Formula 1 specification sole with special line textured grip and improved pedal feel. SFI 3.3 homologated.