Gain safety and peace of mind with the CarbonX® Ultimate™ underwear.  It is made from double jersey interlock knit comprised of a patented blend of high-performance fibers and has extraordinary thermal protective properties. It is inherently flame resistant, will not burn, melt, or ignite when subjected to direct flame. Nomex® or CarbonX® Underwear underneath a racing suit will dramatically improve Thermal Protection Performance (TPP) in the case of an accident involving fire.
SFI 3.3 approved, includes SFI tag. Designed to deliver the ultimate in base layer thermal protection. TPP rating of 13 cal/cm2 and zero seconds after flame. Lightweight, patented blend of high-performance fibers. Double jersey interlock knit. Long sleeve crew neck top available. Bottoms available
Simpson Racing CarbonX Ultimate Underwear Bottoms, Medium Simpson
Simpson Racing CarbonX Ultimate Underwear Bottoms, Medium
Sku # 630020-BOT-M
Mfr. Part # 20601M
Condition
New
Brand
Simpson
Sold
Each
Details

Gain safety and peace of mind with the CarbonX® Ultimate™ underwear.  It is made from double jersey interlock knit comprised of a patented blend of high-performance fibers and has extraordinary thermal protective properties. It is inherently flame resistant, will not burn, melt, or ignite when subjected to direct flame. Nomex® or CarbonX® Underwear underneath a racing suit will dramatically improve Thermal Protection Performance (TPP) in the case of an accident involving fire.

  • SFI 3.3 approved, includes SFI tag
  • Designed to deliver the ultimate in base layer thermal protection
  • TPP rating of 13 cal/cm2 and zero seconds after flame
  • Lightweight, patented blend of high-performance fibers
  • Double jersey interlock knit
  • Long sleeve crew neck top available
  • Bottoms available
  • Sizes: Small to XX-Large available
  • Made in the USA

Learn more about SFI and TPP Ratings by reading our tech article. What are SFI and TPP Ratings

Specs
GTIN Code
090127365991
SFI Rating
3.3
Material Type
Carbon Fabric
Color
Black
Sold in Quantity
Each
Age Group
Adult
Gender
Unisex
Reviews

True to size

Rated
Product Rating
by Rico on August 16, 2024

Summary: Hold up pretty good with repeated use. Easy to wash

Yes, I recommend this product.

Great product

Rated
Product Rating
by McGoey76 on December 25, 2021

Summary: It's a great product, very comfortable well made

I would buy this again.

Rated
Product Rating
by Earl on April 28, 2021

Summary: Fits great.

Yes, I recommend this product.

Related Items / Suggested Parts
Simpson CarbonX® Ultimate™ Fire Resistant Underwear Set
Simpson CarbonX® Ultimate™ Fire Resistant Underwear Set
Tech Support
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About
Speedway Motors is America’s Oldest Speed Shop® and has been a trusted source for specialty rodding and racing products and friendly expert advice for more than 74 years. Founded in 1952 by “Speedy” Bill Smith – a racer and street rodder himself – Speedway has grown from a one-man operation to become the world’s largest manufacturer, distributor and retailer of street rod and racing products. Our industry-leading fast delivery is the result of same-day shipping from our state-of-the-art, centrally located 500,000 sq. ft. headquarters. Speedway’s size offers customers unmatched product selection and low pricing, while our excellent technical support and customer service have made us a recognized leader in the rodding and racing industries.