CarbonX Underwear, Top or Bottom, Simpson

CarbonX Ultimate Underwear 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.

• Designed to deliver the ultimate in base layer thermal protection
• TPP rating of 13 cal/cm² and zero seconds after flame
• SFI 3.3 approved, includes SFI tag
• Lightweight, patented blend of high-performance fibers
• Double jersey interlock knit
• Long or short sleeve crew neck top
  • Short sleeve shirt is NOT SFI approved
• Longjohn bottoms
• Made in the USA
• Color: Black Sizes: S to XXL