- Advanced technology base layer with Alpinestars innovative flame retardant technology incorporating elastane fibre for improved stretch and high levels of comfort. - Stretch construction under new homologation requirements. - Soft touch fabric for superior feel and comfort. - Lenzing FR® material is a natural viscose fibre with unique thermal insulation and flame resistant properties. - Flat seam construction to reduce pressure points and improve strength. - Mouth opening for access to the hydration tube. - Certified to the new FIA 8856-2018 and SFI (SFI:3.3) homologation standards.