Snell approval is a private safety standard that tests helmets more rigorously than the federal DOT standard, and some riders choose Snell-certified helmets because the testing is stricter

The Snell Memorial Foundation is an independent nonprofit organization that runs its own helmet testing program separate from the U.S. Department of Transportation (DOT). A helmet marked with a Snell sticker has passed additional impact tests beyond what DOT requires — specifically, it has been hit harder and from more angles during laboratory testing. Snell does not regulate or approve helmets the way a government agency does; instead, manufacturers send helmets to Snell's lab, pay a fee, and if the helmet passes, they can display the Snell sticker inside.

You will see Snell labels marked as "Snell M2020" or "Snell M2015" (the M stands for motorcycle, and the year indicates when that standard was set). The most current standard is M2020. A helmet can carry both a DOT sticker and a Snell sticker — many do — which means it meets both the federal minimum and Snell's higher bar.

Key Takeaways

  • Snell is a private testing organization, not a government agency, and Snell approval means a helmet passed more severe impact tests than DOT requires.
  • A Snell-certified helmet will have a Snell sticker inside the helmet; the label will show the year of the standard (M2020 is current).
  • Snell testing is optional — DOT approval is the only legal requirement in the United States — but some riders and racing organizations prefer Snell helmets for the extra protection margin.
  • A helmet can carry both DOT and Snell stickers, meaning it meets both standards.
  • Snell-certified helmets typically cost more than helmets with only DOT approval because the manufacturer paid for additional testing.

How Snell testing differs from DOT testing

The DOT standard requires helmets to absorb impact energy and protect the head and face, but the test uses a specific drop height and impact surface. Snell's M2020 standard tests helmets from more angles, with higher impact speeds, and includes tests for penetration, retention (how well the chin strap holds), and shell strength. Snell also tests for what it calls "oblique impact" — a hit that comes at an angle rather than straight down — which DOT does not require.

Neither standard is "better" in an absolute sense; they measure different things. DOT is the legal floor in all 50 states. Snell is a voluntary choice that some riders make because they believe the extra testing margin reduces injury risk. Professional motorcycle racers and some track riders often prefer Snell helmets because racing organizations like the American Motorcyclist Association (AMA) sometimes require or recommend them.

Where to find the Snell label and what it tells you

Open the helmet and look inside the shell, usually near the back or side. You will see a white sticker with the Snell logo, the standard year (M2020, M2015, etc.), and a serial number. The sticker is permanent and cannot be removed without damaging it — that is intentional, to prevent fraud.

If a helmet has no Snell sticker, it does not carry Snell approval. Some manufacturers do not pursue Snell certification because of the cost and time involved. A helmet without Snell approval is not unsafe; it straightforward has not undergone Snell's additional testing. It may still carry a DOT sticker, which is all that is legally required.

Why some riders choose Snell and why others do not

Riders who prioritize maximum protection often choose Snell helmets, especially if they ride on tracks, do high-speed riding, or have experienced crashes before. The extra testing gives them confidence that the helmet has been pushed harder in the lab. Snell helmets also tend to have stricter requirements for comfort and fit, which some riders value.

Other riders choose non-Snell helmets because DOT approval is sufficient for their riding, the helmet fits better, or the price difference matters to their budget. Snell certification adds cost — typically $50 to $150 more than a comparable DOT-only helmet — and not every rider believes the extra margin is necessary for street riding at legal speeds. Both choices are reasonable; the decision depends on your riding style, budget, and personal risk tolerance.

Snell standards change over time

The Snell Foundation updates its standard roughly every five years. The current standard is M2020, which replaced M2015. Older helmets with M2010 or M2005 stickers are still legal to wear, but they were tested to an older standard. If you are buying a new helmet, you will find M2020 certification on current models.

When Snell releases a new standard, manufacturers have a transition period to test and recertify their helmets. During that time, you may see helmets with the older standard still in stores. Neither is unsafe; the newer standard straightforward reflects what Snell learned from crash data and materials science in the years since the previous standard was written.

How to verify a Snell sticker is genuine

The Snell Memorial Foundation maintains a searchable database on its website where you can enter a helmet model and serial number to confirm it was tested and certified. This matters because counterfeit stickers exist, though they are uncommon. If you are buying a used helmet or from an unfamiliar seller, checking the database takes two minutes and gives you certainty.

Genuine Snell stickers are printed on white material with the Snell logo, the standard year, and a unique serial number. The sticker is glued inside the helmet and cannot be peeled off cleanly. If a sticker looks loose, faded, or straightforward to remove, it may not be authentic.

Snell approval and racing or track days

Some racing organizations and track day events require or strongly recommend Snell certification. Before you enter a race or track event, check the rules — they will specify whether DOT alone is acceptable or whether Snell M2020 (or a specific year) is required. If you plan to do any track riding, buying a Snell helmet from the start saves you from having to buy a second helmet later.

Street riding does not require Snell approval anywhere in the United States. Only DOT is mandated by law. Snell is purely a personal choice for street riders, though some choose it anyway for the added protection.

Frequently Asked Questions

Is a Snell helmet safer than a DOT helmet?

Snell helmets have passed more rigorous testing, which means they have been hit harder in the lab. Whether that translates to better real-world protection is debated — crash data is limited, and many factors affect injury outcome. Snell helmets are not proven to prevent injuries better than DOT helmets, but they do have a larger safety margin built in.

Can I wear a helmet with an old Snell standard, like M2010?

Yes, older Snell-certified helmets are still legal and still carry the protection they were tested for. Snell updates its standard based on new research, so M2020 reflects current knowledge, but M2010 or M2015 helmets are not unsafe. If you own one, you can keep wearing it.

What does the number after "M" mean on a Snell sticker?

The number is the year the standard was published. M2020 means the standard was set in 2020. M2015 means 2015. The year tells you how current the testing protocol is, but does not indicate the age of your specific helmet — a helmet made in 2023 could carry M2020 certification.

Do I need Snell approval for street riding?

No. Only DOT approval is required by law in the United States for street riding. Snell is optional and chosen by riders who want extra testing or who plan to do track riding. For legal street use, a DOT-approved helmet is sufficient.

Can a helmet have both DOT and Snell approval?

Yes, many helmets carry both stickers. This means the manufacturer tested the helmet to both standards and it passed both. You will see the DOT sticker on the outside back and the Snell sticker inside.