The rule book stats that any three layer suit or any suit with a SFI 3-2A/5 rating or higher, does not require the use of underwear. A buddy of mine is looking at buying a Simpson STD.19, two layer, one piece suit that claims a rating of "SFI 5". So can anyone tell me if that SFI 5 rating is considered a higher rating than the SFI 3-2A/5? Basically, would it be legal to use without underwear underneath? Thanks for the help!
Kevin
2010 FP Runoffs & Super Sweep Champion
2010 ITB ARRC Champion
2008 & 2009 ITA ARRC Champion
'90 FP Acura Integra RS
'92 ITA Acura Integra RS
'92 ITB Honda Civic DX
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