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Speedway Tru-X-Factor Carbon Underwear, SFI 3.3
Speedway Tru-X-Factor Carbon Underwear, SFI 3.3

Speedway Tru-X-Factor Carbon Underwear, SFI 3.3

Gray, 3.3 SFI Rating, Adult Age Group, Unisex Gender

21 Reviews | 4 Answered Questions
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Speedway Tru-X-Factor Carbon Underwear, SFI 3.3
Speedway Tru-X-Factor Carbon Underwear, SFI 3.3
Speedway Tru-X-Factor Carbon Underwear, SFI 3.3
Speedway Tru-X-Factor Carbon Underwear, SFI 3.3
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  • Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.


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Our exclusive racing underwear is a 50% carbon fiber Nomex, woven together to offer you the ultimate in protection. These have TPP ratings of 14.5 which help ensure your safety. Sizes S-XXL. Nomex top and Nomex pants have been lab tested and are rated SFI 3.3.

  • 50% carbon fiber Nomex
  • TPP rated 14.5
  • SFI rated 3.3
  • Sizes S-XXL

This underwear runs small.  It is recommended you order one size larger than the chart indicates.

Nomex Underwear Sizing Guide (GIF)

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

Some parts are not legal for use in California or other states with similar laws/regulations

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Videos & Articles
  • EMi Employee Frank and Speedway Motors employee Jeremy demonstrate how to properly measure for a race suit.
  • Jason Martin is in the pits at 305 Racesaver Nationals talking to racers about topics they would like more information on. Watch this video to learn how to install a fire suppression system to help keep you safe!
  • It's important to understand the safety ratings on your equipment to ensure your own safety and also meet the requirements of your track rules. Here you can learn the differences between SFI and TPP before you purchase your safety gear.
  • What does McKenna wear at the track? Fire suits and helmets are a given, but under garments are not as well known. Find out why she chooses to wear 'underwear' and the importance of them.
  • After reaching out to a few parents of youth drivers, McKenna has compiled 3 major crucial safety tips that are often times neglected in youth racing. Find out what parents wish they would've known about safety gear before their child started racing.
  • Fire suits are constructed from a variety of fire resistant materials. We can teach you the difference between the most common suits like Nomex and fire resistant cotton such as Proban.
  • It's important to use the right method when you're cleaning fire resistant material. We can show you the recommended procedure to ensure the durability and integrity of your suit through its entire lifecycle.

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