Underwear PRO-TX Bottom Black X Large SFI 3.3

The BELL Underwear PRO-TX Bottom Black X Large SFI 3.3 is a professional-grade fire-retardant base layer engineered for motorsports competitors and performance drivers who demand maximum thermal protection without sacrificing mobility. Whether you're running road-course events, drag racing, or high-performance driving on the track, this garment serves as your critical inner defense layer—the first barrier between your skin and any thermal hazard. SFI 3.3 certification ensures this bottom meets the stringent safety standards required by sanctioning bodies across North America, making it race-legal and trusted by serious drivers.

The PRO-TX construction uses a fire-retardant blend fabric designed to resist ignition and limit flame spread during the critical first seconds of thermal exposure—time that can mean the difference between safety and serious injury. The X-Large sizing provides full coverage and unrestricted range of motion for extended wearing comfort during long race weekends or extended track sessions. The material's breathability prevents excessive moisture buildup while maintaining its protective properties, and the design integrates seamlessly under race suits or standalone under driving gear, offering flexibility in your thermal management strategy.

Serious racers—from club-level competitors to professional drivers—depend on the Underwear PRO-TX Bottom as part of a complete fire-protection system. It's ideal for use under SFI-certified racing suits, nomex racing gear, or worn as a standalone protective layer under normal clothing for drivers who regularly operate high-performance vehicles. This bottom integrates with other BELL PRO-TX components to create a comprehensive fire-protection ensemble, and its durability withstands repeated washing and season-long use without degradation of protective properties. For anyone serious about motorsports safety, this is essential equipment.