Fire-resistant racing underwear
Close-fitting Nomex® knit base layers worn under the suit, developed around SFI 3.3.
What SFI 3.3 asks of underwear
Underclothing must cover the body from neck to ankles and wrists, fit snugly at those openings and reach a minimum TPP of 6.0 cal/cm². The patch goes on the left sleeve or shirt hem of tops and the left belt line of pants.
Underwear does not count towards the suit's SFI 3.2A rating, but some series require it with lower-rated suits.
Fit
Base layers are cut for a close, next-to-skin fit, so wearers should order their true size.
Material: Nomex® Knit Underlayer
| Composition | Meta-aramid (Nomex®) knit |
|---|---|
| Construction | Soft knit for a close, next-to-skin fit |
| Fire resistance | Inherent — meta-aramid fibre |
From Cuircon's materials library. A material figure is not a garment certification. Ask for the test report behind any figure.
SFI 3.3 at a glance
| Issued by | SFI Foundation, Inc. |
|---|---|
| Current edition | Effective 1 April 2022 |
| Covers | Gloves, underclothing, hoods, socks, shoes and boots, and other driver accessories |
| Graded by | Gloves: TPP of the top of the glove (grades /1 to /30). Other items: pass/fail minimum TPP. |
| Who certifies | The manufacturer, under a licence agreement with SFI |
From the official specification. Read the full SFI 3.3 guide.
Products in this range
In development for certification
Designed around an SFI specification. Certification status, certifying manufacturer and labelling for your order are confirmed in the quotation.
Related: FR socks · FR balaclavas · SFI 3.2A/1 suits · SFI guide · Construction library · Who we serve