The Alpinestars FR Short Sleeve Top is a Nomex-construction base layer built for racers who prioritize comfort and fire resistance under the suit. Made from 180g 100% Nomex/Meta-Aramide fabric with Kevlar-reinforced thread, it delivers inherent flame resistance without sacrificing wearability. Flat seam and interlock wave construction eliminate pressure points during long stints in the car. Note: this top is not homologated and does not carry FIA or SFI certification.