When you’re strapped into a race car, every layer between you and the fire-resistant suit matters. Nomex underwear isn’t just a comfort item—it’s a critical part of your safety gear that can buy you precious seconds in an emergency. But with so many options on the market, how do you choose the right one for your needs?
This guide breaks down the top 10 Nomex underwear sets and bottoms, from budget-friendly SFI 3.3 options to high-end FIA-approved designs. Whether you’re a weekend track day warrior or a professional racer, you’ll find the perfect balance of protection, comfort, and durability for your specific racing discipline.
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RaceQuip® 422997RQP Underwear Bottom – SFI 3.3 – Nomex – Black – 2XL
Best forLightweight moisture-wicking comfort
- Lightweight aramid blend
- Excellent moisture wicking
ConsiderLimited size availability
RJS Racing Equipment 800010004 Nomex Underwear
Best forComplete medium-size protection
- Full two-piece set
- SFI 3.3 certified
ConsiderLimited color options
RJS Racing Equipment 800010006 Nomex Underwear
Best forX-large full coverage set
- Roomy X-large fit
- SFI 3.3 certified
ConsiderWhite shows stains
OMP Underwear Underwear Bottom, One EVO, FIA Approved, Nomex, Black, X-Larg…
Best forFIA-approved seamless stretch
- FIA approved safety
- Seamless stretch fabric
ConsiderPremium price point
OMP Underwear Bottom, One EVO, FIA Approved, Nomex, Black, Small, Each
Best forSmall-size FIA protection
- Perfect small fit
- FIA approved
ConsiderOnly bottom included
K1 RaceGear 26-PSS-N-XL Underwear Top, Precision, Short Sleeve, High Collar…
Best forHigh-collar cool comfort
- Meta-aramid cool fabric
- High collar protection
ConsiderNo bottom included
RJS Racing Equipment 800010005 Nomex Underwear
Best forLarge-size US-made set
- Made in USA
- SFI 3.3 certified
ConsiderWhite color shows dirt
OMP Tecnica Evo Nomex Underwear Pants FIA8856-2018 – Black – XXLarge (IE0-0…
Best forPro-level FIA cooling pants
- FIA 8856-2018 approved
- 3D cooling inserts
ConsiderPremium price
OMP Tecnica Evo Nomex Underwear Pants FIA8856-2018 – White – XLarge (IE0-07…
Best forWhite X-large FIA pants
- FIA approved latest standard
- White heat-reflective color
ConsiderHigh investment
RaceQuip Long John Underwear Bottoms SFI 3.3 Fire Retardant FR Black X-Larg…
Best forFlat-seam comfort bottoms
- Flat-sewn strategic seams
- SFI 3.3 rated
ConsiderNo top included
RaceQuip SFI 3.3 Underwear Bottom – Lightweight Comfort
Brand: RaceQuip
A top-tier SFI 3.3 bottom for racers who value breathability and skin comfort.
The RaceQuip 422997RQP bottom is crafted from a lightweight aramid and FRC blended fabric that feels almost like a second skin. You’ll appreciate how the superior moisture-wicking properties pull sweat away from your body, keeping you dry even during intense stints. The hypoallergenic material won’t irritate sensitive skin, making it a solid choice for long endurance races.
What really stands out is the soft, supple knit that dries quickly after a hot session or a wash. The flat-sewn seams are strategically placed to prevent chafing when you’re strapped into the cockpit. If you’re looking for a reliable SFI 3.3 bottom that prioritizes breathability and all-day comfort, this RaceQuip option delivers without breaking the bank.
- Lightweight aramid blend
- Excellent moisture wicking
- Hypoallergenic and soft
- Limited size availability
- No top included
RJS Racing Equipment Nomex Underwear – Medium White Set
Brand: RJS Racing Equipment
A reliable, complete SFI 3.3 set for medium-framed racers.
The RJS Racing Equipment 800010004 is a complete two-piece Nomex underwear set in a clean white finish, designed for drivers who need full coverage from head to toe. With SFI 3.3 certification, you get proven fire resistance that meets the standards for most club-level racing series. The package weight of 1.31 pounds indicates a substantial fabric density that offers solid protection without feeling overly bulky.
This set includes both a top and bottom, so you’re fully covered from the start. The white color helps reflect heat and makes it easy to spot any dirt or wear. If you’re a medium-sized driver looking for a straightforward, no-frills Nomex set that gets the job done, this RJS option is a dependable choice that won’t let you down.
- Full two-piece set
- SFI 3.3 certified
- Substantial fabric weight
- Limited color options
- May run slightly large
RJS Racing Equipment Nomex Underwear – X-Large White Set
Brand: RJS Racing Equipment
A dependable SFI 3.3 set for larger drivers seeking full coverage.
For taller or broader drivers, the RJS Racing Equipment 800010006 offers the same trusted SFI 3.3 protection in an X-large size. This two-piece Nomex underwear set ensures you have full coverage without restriction, thanks to its roomy fit that accommodates movement in the cockpit. The package dimensions suggest a well-packed product that arrives in good condition, ready to wear.
Like its medium counterpart, this set features a white finish that’s practical and heat-reflective. The Nomex material is breathable enough for long races, and the elastic cuffs help keep everything in place. If you’ve struggled to find Nomex underwear that fits comfortably in larger sizes, this RJS set is a solid pick that prioritizes both safety and freedom of movement.
- Roomy X-large fit
- SFI 3.3 certified
- Complete set included
- White shows stains
- Limited stretch
OMP One EVO Underwear Bottom – FIA Approved Stretch
Brand: OMP RACING, INC.
A premium FIA-approved bottom that combines safety with exceptional comfort.
The OMP One EVO bottom in black is engineered for drivers who demand the highest level of certification—FIA approval. This X-large option features a comfortable stretch seamless fabric that moves with your body, eliminating pressure points during long stints. The seamless construction is a game-changer, as it reduces friction and allows for a truly unrestricted range of motion.
OMP is a trusted name in motorsport, and this bottom reflects that pedigree. The FIA approval means it meets the strictest international safety standards, giving you peace of mind in any racing series. The black color is sleek and professional, and the stretch fabric ensures a snug yet flexible fit. If you’re a serious racer who wants top-tier protection without sacrificing comfort, this OMP bottom is an excellent investment.
- FIA approved safety
- Seamless stretch fabric
- Professional black design
- Premium price point
- Limited to bottom only
OMP One EVO Underwear Bottom – Small Size Precision
Brand: OMP RACING, INC.
A tailored FIA-approved bottom for smaller drivers who refuse to compromise.
If you’re a smaller-framed driver, the OMP One EVO bottom in small is tailored to fit you perfectly. This FIA-approved piece uses the same comfortable stretch seamless fabric as its larger counterparts, ensuring you get the same level of protection and mobility. The seamless design is particularly beneficial for petite drivers, as it prevents bunching and chafing in tight cockpit spaces.
OMP’s attention to detail shines through in the fabric’s moisture management, which keeps you cool under pressure. The black color is versatile and matches any racing suit. While it’s a bottom-only product, the FIA certification makes it a top choice for professional and amateur racers alike. If you’ve struggled to find Nomex gear that fits smaller sizes well, this OMP option is a standout.
- Perfect small fit
- FIA approved
- Seamless comfort
- Only bottom included
- Higher cost
K1 RaceGear Precision Top – High Collar Short Sleeve
Brand: K1 RaceGear
A breathable, high-collar top that prioritizes coolness and neck safety.
The K1 RaceGear Precision top is a short-sleeve, high-collar design that offers a unique blend of protection and ventilation. The meta-aramid construction is specifically engineered for cool comfort, making it ideal for hot weather racing where overheating is a concern. The high collar provides extra neck protection, a feature often overlooked in standard underwear tops.
This X-large top is perfect for drivers who prefer a lighter layer under their suit. The short sleeves allow for greater arm mobility, while the high collar ensures critical areas are shielded. K1 RaceGear has designed this top with the racer’s needs in mind, balancing safety with breathability. If you’re looking for a top that keeps you cool without compromising on fire resistance, this Precision model is a worthy contender.
- Meta-aramid cool fabric
- High collar protection
- Short sleeves for mobility
- No bottom included
- Limited color options
RJS Racing Equipment Nomex Underwear – Large White Set
Brand: RJS Racing Equipment
A quality American-made SFI 3.3 set for large-framed racers.
This RJS Racing Equipment set is the large size option, offering the same SFI 3.3 certification and two-piece design as the other sizes in the range. Made in the United States, this set reflects a commitment to quality manufacturing. The package weight of 1.45 pounds indicates a slightly denser fabric, which can provide added peace of mind in terms of thermal protection.
The white color is classic and practical, and the fit is tailored for drivers who need a bit more room without going to X-large. The set includes both top and bottom, so you’re fully equipped for race day. RJS has a solid reputation in the racing community, and this large set lives up to that legacy. If you’re a large-sized driver looking for a dependable, American-made Nomex set, this is a strong option.
- Made in USA
- SFI 3.3 certified
- Complete two-piece set
- White color shows dirt
- Limited stretch
OMP Tecnica Evo Pants – FIA 8856-2018 Advanced Cooling
Brand: OMP
The ultimate FIA-approved pants for drivers who demand cutting-edge cooling.
The OMP Tecnica Evo pants are the pinnacle of Nomex underwear technology, featuring FIA 8856-2018 approval—the latest and most stringent safety standard. The ultra-flat seam construction ensures maximum comfort, eliminating any pressure points that could distract you during a race. The high-tech fabric is designed for optimal breathability, allowing heat to escape while maintaining protection.
What truly sets these pants apart are the 3D knitting inserts that enhance cooling in extreme heat, a feature you’ll appreciate during summer races. They’re also compatible with OMP’s ‘ONE’ range and TECNICA EVO suits via the DRY SYSTEM technology, ensuring seamless integration with your existing gear. In XX-large, these pants offer a roomy yet secure fit. If you’re a professional or serious amateur racer, these pants are worth every penny.
- FIA 8856-2018 approved
- 3D cooling inserts
- Ultra-flat seams
- Premium price
- Only pants included
OMP Tecnica Evo Pants – White X-Large FIA Approved
The OMP Tecnica Evo pants in white and X-large offer the same advanced features as their black counterpart, but with a lighter color that reflects heat. This FIA 8856-2018 approved garment is built for maximum comfort, with ultra-flat seams that prevent chafing during long races. The high-tech fabric promotes optimal breathability, ensuring you stay cool even when the track temperature soars.
The 3D knitting inserts are strategically placed to enhance cooling in the hottest zones, making these pants ideal for endurance events. The DRY SYSTEM compatibility means they pair perfectly with OMP suits, but they also work well with other brands. If you prefer a white base layer for heat reflection or aesthetic reasons, this X-large option delivers top-tier performance. It’s a premium choice for drivers who want the best in thermal management.
- FIA approved latest standard
- White heat-reflective color
- 3D cooling technology
- High investment
- Pants only
RaceQuip Long John Bottoms – SFI 3.3 Flat Seams
Brand: RaceQuip
A comfortable SFI 3.3 bottom with thoughtful seam placement for long races.
The RaceQuip Long John bottoms are a step up from the standard model, featuring SFI 3.3 rating with tags affixed for easy verification. The lightweight aramid and FRC blended fabric offers the same superior moisture-wicking properties, but the standout feature here is the strategically placed, flat-sewn seams. These seams are designed to sit away from high-friction areas, ensuring you stay comfortable even when you’re tightly harnessed.
This X-large bottom is hypoallergenic and dries quickly, making it a practical choice for multi-day race events. The black color is low-profile and matches any suit. RaceQuip has focused on the details that matter, from the soft knit to the seam placement, to create a bottom that feels as good as it protects. If you’re in the market for a reliable SFI 3.3 bottom with enhanced comfort features, this is a top pick.
- Flat-sewn strategic seams
- SFI 3.3 rated
- Quick-dry fabric
- No top included
- Limited sizes
Buyer’s Guide: What to Consider
Choosing the right Nomex underwear involves balancing safety certifications, comfort, and fit. Here are key factors to consider before making your purchase.
- Certification Standards: Look for SFI 3.3 or FIA 8856-2018 approval. SFI 3.3 is common for club racing, while FIA is required for international events. Always check your series regulations.
- Fabric and Breathability: Nomex blends with aramid fibers offer fire resistance, but breathability varies. Look for moisture-wicking properties and 3D knitting for cooling in extreme heat.
- Fit and Sizing: Underwear should fit snugly but not restrict movement. Consider your body size and the suit's fit. Seamless or flat-seam designs reduce chafing.
- Set vs. Separate: Some products come as a two-piece set (top and bottom), while others are sold separately. Decide if you need full coverage or just a bottom to match an existing top.
- Comfort Features: Look for hypoallergenic materials, quick-dry fabrics, and strategic seam placement. High collars and stretch fabrics enhance comfort and protection.
Conclusion
Selecting the best Nomex underwear is a critical decision for any racer. From budget-friendly SFI 3.3 sets like the RJS options to premium FIA-approved pieces from OMP, there’s a product for every need and budget. Consider your racing series requirements, climate, and personal comfort preferences to make the right choice.
For most drivers, the RaceQuip bottoms offer excellent value and comfort, while serious competitors will appreciate the advanced cooling of the OMP Tecnica Evo pants. Whatever you choose, ensure it fits well and meets the safety standards of your sport. Stay protected and race on.
Erica Steven is the founder and lead writer of WorstBrands, a site dedicated to providing honest and trustworthy reviews about outdoor gear and fashion products.
With a passion for exploring the great outdoors and staying up to date on the latest fashion trends, Erica uses her expertise to provide valuable insights into the products that matter most to her readers.
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