Helmet Standards Explained: DOT, ECE 22.06 and Snell and What Each Mark Tests

DOT is the US federal helmet standard (FMVSS No. 218), and the maker certifies that each helmet meets it. ECE 22.06 is the 06 series of UN Regulation No. 22, used in many markets outside the US. Snell is a voluntary standard that sits on top. This page explains what each mark covers, what changes with ECE 22.06 and what to look for on a helmet you plan to wear in the US.

Part of our motorcycle riding gear guide.

Key takeaways

• In the US the mandatory standard is DOT; ECE is not a US regulatory requirement.
• DOT does not mean the government approved the helmet: the maker self-certifies, and the label says so in a fixed wording.
• Snell is voluntary. Its M2020D variant is built around DOT-level helmets and M2020R around ECE-level helmets.
• Some helmets carry more than one mark, so confirm the wording applies to the exact model you are buying.
• A mark is not the whole decision. Fit, coverage and age matter too.

The three marks side by side

What the DOT standard tests

FMVSS No. 218 applies to helmets designed for use by motorcyclists and other motor vehicle users. It has four performance areas:

• Impact attenuation: peak acceleration may not exceed 400 g, with limits on how long it stays above 200 g and 150 g.
• Penetration: a striker must not touch the test headform.
• Retention: the chin strap system must hold specified loads without separating.
• Peripheral vision: at least 105 degrees to each side.

Each helmet also carries a permanent label with the maker's name, the size and the month and year of manufacture, and a separate DOT certification label. The manufacture date matters later, when you decide how old is too old; see when to replace each piece of your motorcycle kit.

One caution from the sources: Snell calls both DOT and ECE government minimum standards that rely mostly on makers to police themselves. A helmet maker's own guide says the same about the US system: self-certification, with no advance approval by NHTSA. We could not read NHTSA's own pages (blocked), so check them for the current wording.

What changes with ECE 22.06

ECE 22.06 replaced the earlier 22.05 series. The British Motorcyclists Federation lists these changes:

• More impact tests: different speeds, on flat, sloping and kerb-shaped surfaces, and at more points across the shell.
• Modular helmets are tested with the chin bar closed and open.
• Visors must withstand a steel ball fired at 60 m/s (134 mph) without fracturing, deforming or detaching.
• Sun shields must move separately from the visor.
• Accessories are tested, so fitting a part the maker did not test can change how the helmet performs.

Sources disagree on one point. Some press coverage describes a new rotational (oblique) impact test. One magazine says the rotational test is unchanged, and the article above does not describe one. We could not read the UN text, so we do not state it either way. Dates differ too, so we give no single date for when sales rules apply.

Where Snell fits

Snell standards are voluntary, and many makers certify to them because many buyers look for the label. Snell says M2020D looks for all the protection that might be built into a helmet that would still meet DOT, and M2020R does the same for a helmet that might still meet ECE. So the letter tells you which family the helmet was built around.

Can you use an ECE helmet in the US?

Start with what the sources say. The mandatory US standard is DOT, and ECE is not a regulatory requirement. Helmets sold as motorcycle head protection must meet the federal standard. Helmets that carry both a DOT label and an ECE mark exist, depending on model and market.

What we did not verify: how each state's law treats an ECE-only helmet. We read no state statute, so we do not say what your state accepts. Only 17 states and the District of Columbia require all riders to wear a helmet, and the rest differ. The practical route is to buy a helmet with the DOT label and read your state's code; our required motorcycle equipment hub covers the rules by place.

Read a helmet label in 60 seconds

1. Find the permanent DOT label: DOT, FMVSS No. 218 and CERTIFIED, with the model and maker.
2. Note the month and year of manufacture, which the same standard requires on the helmet.
3. If there is an ECE or Snell mark, read the series or variant (22.06; M2020D or M2020R).
4. Check that the wording applies to the exact model on the box or product page, not a similar one.
5. Check coverage. Crash-involved riders in half-coverage helmets were twice as likely to suffer traumatic brain injuries as riders in open-face or full-face helmets.

Helmets sold as novelties are a separate warning: riders in non-compliant novelty helmets were about twice as likely to die in crashes as riders in certified full-face helmets.

What a mark does not tell you

A mark tells you a helmet was certified to a test. It does not tell you the helmet fits your head, and it does not make an old helmet new. For the piece-by-piece checklist see how to choose proper motorcycle riding gear. Clothing has its own marks, covered in CE ratings by piece.

If you want the same label-reading habit for jackets, pants, gloves and boots, see Leather Collection's guide to reading a gear label. It covers garments, armor, gloves and boots, not helmets.

FAQ

Are ECE helmets better than DOT?

The sources we read do not rank them. They are different standards with different test sets, and Snell calls both minimum standards. ECE 22.06 tests at more points and adds visor and accessory tests, but a DOT helmet is the one that carries the US federal label.

Does the Department of Transportation approve DOT helmets?

No. The maker certifies that the helmet meets FMVSS No. 218, and NHTSA does not approve helmets in advance.

Is a Snell helmet required?

No. Snell standards are voluntary.

Can I use a helmet with only an ECE mark in the US?

ECE is not a US regulatory requirement, and state rules differ. We have not verified any state's rule, so read your state's code or choose a helmet that also carries the DOT label.