- Advanced technology base layer with Alpinestars innovative flame retardant technology incorporating elastane fibre with improved elasticity 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. - Certified according to the new FIA 8856-2018 and SFI homologation standards (SFI:3.3).