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| Size | US | Chest | Waist | Hip |
|---|---|---|---|---|
| XS | 2 | 32 | 24 - 25 | 33 - 34 |
| S | 4 | 34 - 35 | 26 - 27 | 35 - 26 |
| M | 6 | 36 - 37 | 28 - 29 | 38 - 40 |
| L | 8 | 38 - 29 | 30 - 31 | 42 - 44 |
| XL | 10 | 40 - 41 | 32 - 33 | 45 - 47 |
| XXL | 12 | 42 - 43 | 34 - 35 | 48 - 50 |
What SFI stands for, what an “SFI approved” tag on a race suit actually certifies, who the SFI Foundation is, and how suits get tested and re-certified — so you can tell a genuine tag from a worthless one at tech inspection.
What the SFI Foundation certifies, how to read the tag, and how to spot gear that won’t pass tech
In motorsports, safety is never optional — it's a requirement. From helmets and gloves to racing suits and harness systems, every piece of protective equipment must meet strict performance standards. One of the most recognized and trusted safety benchmarks in racing is SFI certification.
If you're buying professional racewear, understanding SFI ratings is essential. Whether you compete in drag racing, stock car racing, or endurance events, your gear must meet specific protection levels to keep you safe and compliant with regulations. Need to skip the theory and find out the exact rating your class requires? See our SFI rating-by-class quick reference for sprint car, drag, dirt, karting, road racing, and powerboat.
SFI certification is a safety standard developed by the SFI Foundation Inc., an independent non-profit organization that establishes performance specifications for motorsports safety equipment.
Their role is simple but critical: they test and certify racing gear to ensure it performs reliably under extreme conditions such as fire exposure, high impact, and intense heat.
When you see an SFI label on racewear, it means the product has been tested and approved to meet strict safety performance requirements.
Motorsports environments expose drivers to serious risks, including fire hazards, fuel ignition, and extreme cockpit temperatures. SFI standards are designed to provide measurable protection levels so drivers, teams, and race officials know exactly how much safety gear can handle.
Most professional racing organizations require SFI-certified equipment for competition, including major series like:
Without proper certification, drivers may not be allowed to compete.
SFI ratings are numerical classifications that indicate how much protection a piece of gear provides. For racing suits, the most common specification is SFI Spec 3.2A, which measures fire resistance and thermal insulation.
Each rating reflects how long the suit can protect a driver from second-degree burns when exposed to direct flame. Higher numbers mean higher protection.
Certification and rating are two different things. Certification is the yes-or-no question this page answers — is the garment SFI approved at all. The rating is the number after it, and it tells you how much thermal protection you get: 3.2A/1 at the entry level, 3.2A/5 as the common competitive standard, and higher tiers for drag racing and other high-fire-risk classes.
We keep the full tier-by-tier breakdown in one place rather than repeating it here. See the complete SFI ratings guide for what each number means and which one your class requires.
SFI suits are tested using TPP (Thermal Protective Performance) — a laboratory measurement of how long a material shields skin from heat before injury occurs. It’s why a certified suit gives you a predictable protection figure rather than a marketing claim.
Read the full TPP explainer — including why two suits with the same SFI rating can offer different real-world protection.
Every certified racing suit includes an official SFI label sewn into the garment. This label confirms:
Important
Always check the label before racing. If the label is missing or damaged, the suit may not pass technical inspection.
Safety equipment does not last forever. Exposure to heat, wear, UV light, and washing can degrade protective materials over time. Many racing organizations require periodic inspection or recertification depending on equipment type.
Best practice:
Never assume old gear still meets safety standards. When in doubt, replace it.
A suit can be genuinely SFI certified and still fail tech, because your class specifies a minimum rating — not just any certification. A valid 3.2A/1 tag won’t get you through a lane that requires 3.2A/5.
Confirm the minimum for your class before buying, not on race morning. Our rating-by-class guide covers NHRA, SCCA, dirt and circle track series individually.
Choosing SFI-certified racing suits provides major advantages:
A properly rated SFI racing suit is more than protective clothing — it's engineered safety designed to perform when it matters most. Race smart. Choose certified protection. Trust proven safety standards.
Keep going — more racing-suit guides from the HS Race Gear blog.
Which SFI rating each dirt oval body requires, by class. Street stock through winged sprint car, plus what tech actually checks.
SFI 3.2A is tiered and US-focused; FIA 8856-2018 is single pass/fail and international. Why one won't reliably substitute for the other.
The hidden number behind every SFI rating. Why two SFI 3.2A/5 suits can have different TPP scores, and how to find the actual number.
Every HS Race Gear suit is SFI certified, built with premium Nomex® materials, and custom-fit to your exact measurements. Starting at $289.
