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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 |
Every SFI rating decoded — 3.2A/1 (single-layer, 3-second protection), 3.2A/5 (multi-layer, 10-second protection), 3.2A/15 (drag racing top-tier), and 3.3/5 (gloves & shoes). Learn which rating your sanctioning body requires and shop SFI-certified gear from HS Race Gear.
Guide last verified: September 2026 · 7 min read
The SFI Foundation is an independent, non-profit organization that develops and administers performance standards for motorsports safety equipment — fire suits, gloves, shoes, helmets, and harnesses. SFI certification is required by nearly every major US sanctioning body before a car or driver passes tech inspection.
Every SFI rating referenced on this page, what it covers, and where it's typically required. Ratings run on the SFI 3.2A spec for suits — the higher the number after the slash, the more layers and the longer the protection window.
| Rating | Protection Level | Applies To | Typical Use |
|---|---|---|---|
| SFI 3.2A/1 | TPP ≥ 6 · ~3 sec to 2nd-degree burn | Racing suits (single-layer) | Karting-equivalent, track days, entry-level drag brackets |
| SFI 3.2A/5 | TPP ≥ 19 · ~10 sec to 2nd-degree burn | Racing suits (multi-layer) | Sprint car, dirt late model, road racing, most circle track |
| SFI 3.2A/15 | Higher TPP tier than 3.2A/5 | Racing suits (heavy multi-layer) | Drag racing faster than ~7.49 ET — Pro Stock, alcohol classes |
| SFI 3.2A/20 | Highest common automotive TPP tier | Racing suits, integrated protection | Top Fuel, Funny Car, nitro classes |
| SFI 3.3/5 | Equivalent to 5-layer suit protection | Gloves & shoes | Any series requiring an SFI 3.2A/5 suit or higher |
| SFI 3.4/5 | NASCAR-spec uniform standard | Fire-resistant uniforms | NASCAR-sanctioned national touring series |
TPP thresholds are set and periodically revised by the SFI Foundation. Always confirm the current spec against your sanctioning body's rulebook and the SFI Foundation's official documentation before ordering. Want TPP explained in plain English? Read our TPP rating guide.
The base tier of the SFI 3.2A spec: a single-layer suit rated for roughly 3 seconds of protection before second-degree burn risk. It's the common baseline for track days and lower-ET drag brackets that don't require a multi-layer suit. See which rating your class actually needs.
Required for intense oval track, dirt, and drag racing. Offers a high Thermal Protective Performance (TPP) rating and is the practical floor for most weekly sprint and circle-track divisions.
Required once a drag car runs faster than roughly 7.49 ET under NHRA rules — Pro Stock, alcohol, and quick sportsman classes. Typically paired with SFI 3.3-rated head sock, gloves, and shoes. See the full drag racing ET-to-rating ladder, or build a custom 3.2A/15 drag suit.
The rating tier used in Top Fuel, Funny Car, and other nitro classes, where fire risk during an incident is at its highest. 3.2A/20 suits pair with integrated head, neck, and hand protection and require frequent recertification under NHRA rules. See our custom drag racing suit builder.
Engineered to protect extremities while maintaining the tactile feel required for precise steering and pedal control. Shop custom SFI 3.3/5 gloves or SFI 3.3/5 shoes, built to your measurements.
A separate spec from the 3.2A suit ratings, SFI 3.4/5 certifies fire-resistant uniforms used in NASCAR-sanctioned national touring series. If you race under NASCAR sanctioning, confirm with your tech inspector whether 3.4/5 applies to your class.
Every custom suit, glove, and shoe from HS Racegear includes a genuine SFI certification patch permanently affixed to the garment exterior. This ensures zero delays or issues during pre-race tech inspections.
Everything on this page covers SFI, the standard for car racing suits. Karting uses a different standard entirely — CIK-FIA Level 2, which tests abrasion resistance rather than thermal protection, because a kart presents a different hazard than a car.
An SFI-rated car suit will generally not pass karting tech inspection, and a CIK Level 2 kart suit is not a substitute for an SFI suit in a car. If you race both, you need both. Read the CIK-FIA Level 2 guide.
SFI stands for SFI Foundation, Inc. — an independent non-profit organization that sets and administers performance standards for racing safety equipment including fire suits, gloves, shoes, helmets, and harnesses.
SFI ratings for racing suits measure fire protection level. SFI 3.2A/1 (single-layer) provides approximately 3 seconds of protection from a flash fire, while SFI 3.2A/5 (multi-layer) provides approximately 10 seconds. Most sanctioning bodies require at minimum SFI 3.2A/1, and many competitive series require SFI 3.2A/5.
SFI 3.2A/1 is a single-layer fire suit offering about 3 seconds of thermal protection — suitable for karting and lower-risk environments. SFI 3.2A/5 is a multi-layer suit offering about 10 seconds of protection, required for most circle-track, drag, and sprint car racing series. HS Race Gear offers both, custom-built to your measurements.
SFI approved means the product has been independently tested and certified by the SFI Foundation to meet a specific performance standard. SFI-approved racing gear carries a dated SFI label confirming it passed the required fire resistance, tensile strength, and seam integrity tests.
SFI 3.3/5 is the certification standard for racing gloves and shoes. It certifies that the product provides fire resistance equivalent to a 5-layer suit's protection level at the hands and feet. Most racing series that require an SFI 3.2A/5 suit also require SFI 3.3/5 gloves and shoes.
Yes. SFI-certified racing gear is labeled with a manufacture date, and most sanctioning bodies consider SFI labels valid for 2–5 years depending on the series rules. Always check your series tech inspection requirements. HS Race Gear ships new gear with a current SFI label.
Sources: rating tiers and thresholds referenced above are based on publicly published SFI Foundation specifications. For the current, authoritative spec sheets, always check with the SFI Foundation directly or your sanctioning body's tech inspector.
