Alpinestars ZX Series EVO v2 layers are constructed with Lenzing FR , an innovative natural viscose fiber that affords exceptional flame resistance and protection against heat transfer. This Formula 1 specification underwear is extremely lightweight and thin, while being incredibly soft to the touch for greatly enhanced comfort when wearing a driving suit. ALPINESTARS ZX EVO V2 UNDERLAYER PANT PROTECTION Certified to the new FIA 8856-2018 homologation standard. Constructed with Lenzing FR flame-resistant material. ALPINESTARS ZX EVO V2 UNDERLAYER PANT CONSTRUCTION Stretchable construction under new homologation standard requirements Lightweight, seamless tubular construction for optimum comfort. ALPINESTARS ZX EVO V2 UNDERLAYER PANT KEY FEATURES Fabric composition with a high percentage of Lenzing FR fiber for enhanced garment performance. Jaquard motif with Alpinestars knee logo for a unique design.