Undearwar Top ZX EVO V3 Ylw XSml/Sml Long Slve

The Alpinestars Undearwar Top ZX EVO V3 in fluorescent yellow is purpose-built for drivers and pit crew who demand fire-resistant base layer protection in high-heat automotive environments. Whether you're running an endurance race, testing modifications on the dyno, or working extended hours in a performance shop, this long-sleeve undershirt provides the thermal barrier required by sanctioning bodies like FIA and SFI 3.3 certification standards. It's the foundational layer every serious automotive enthusiast needs under their racing suit or nomex gear.

Constructed from Lenzing FR fabric, this top delivers inherent flame resistance without compromising breathability—critical when you're managing engine heat during long tuning sessions or track days. The high collar design protects the neck area, a vulnerable zone in any thermal event, while the long sleeves extend coverage down the forearms. The high-visibility fluorescent yellow colorway ensures visibility in pit lanes and garage environments, meeting both safety standards and professional visibility requirements. At just 0.29 lbs, the garment adds minimal bulk under your race suit while providing consistent, reliable thermal protection across repeated exposure to elevated temperatures.

This XS/Small sizing fits compact drivers and pit crew members who need form-fitting base layers that won't bunch or create hot spots under full racing suits. Mechanics and fabricators working in high-temperature shops—welding areas, engine bays during extended diagnostics, or dyno cells—will appreciate the protection during technical work. The SFI 3.3 and FIA approval means it satisfies sanctioning body requirements for professional racing, club-level events, and serious amateur competition. Pair it with your existing safety gear for comprehensive thermal management during any automotive performance application.