Carbon X Underwear Top Short Sleeve Large

The Carbon X Underwear Top Short Sleeve Large is a purpose-built racing and motorsports base layer designed for drivers and pit crew who operate in high-temperature environments. Whether you're running laps on track, competing in autocross, or working extended hours in an engine bay, this Simpson Safety garment serves as critical thermal protection under a racing suit or heavy protective gear. The short-sleeve crewneck design provides unrestricted arm mobility while maintaining full torso coverage—essential when you're gripping a steering wheel hard or reaching across an engine compartment during vehicle diagnostics and modifications.

Built from advanced CarbonX fabric, this underwear top delivers superior flame resistance and thermal management that outperforms standard cotton or polyester layers. CarbonX technology is engineered to resist ignition and char, meeting rigorous motorsports safety standards required in sanctioned competition and professional pit environments. The material's breathable construction prevents moisture buildup during intense physical exertion, which is critical when wearing multiple layers under a racing suit for 2–4 hour endurance events or during sustained vehicle fabrication work. The crewneck collar provides clean, secure coverage without chafing—a detail that matters when wearing the garment for 8+ hours during track days or restoration projects.

This Large size fits drivers, mechanics, and motorsports enthusiasts who need reliable base-layer protection during competition, testing, or high-performance vehicle work. The black colorway is standard across Simpson Safety's CarbonX line and won't show wear or staining during intensive shop use. Size Large typically accommodates athletic to standard builds; verify your Simpson Safety sizing chart against your typical racing suit size for proper fit under full protective equipment. Pair this with Simpson Safety SFI-approved race suits, helmets, and gloves to complete a comprehensive flame-resistant system for circuit racing, drag racing, rally, or professional automotive fabrication environments.