Ski helmet safety standards, and why there is no safest helmet

What the standards test

Both standards work the same way in outline. A helmet is instrumented and dropped onto a fixed anvil, and the acceleration measured inside must stay under a threshold. Beyond that, the standard specifies which region of the head must be covered and how much force the retention system must survive without releasing.

Class A and Class B, in practice

EN 1077 has two classes and almost every recreational helmet you will see is Class B. Class A covers more of the head, particularly at the ears, and is aimed at racing and higher-speed disciplines. Class B trades a little of that coverage for hearing and ventilation, which is why it is what recreational skiers wear.

This is a genuine trade-off rather than one being the cheap version of the other. A helmet that seals your ears makes it harder to hear a skier approaching from behind, which is its own safety consideration on a busy resort run.

Why nobody can tell you the safest helmet

Because certification is a pass or fail, not a score. Every certified helmet met the same threshold; the standard does not publish how far under it each one landed, and helmet makers do not publish their own test margins.

Some independent labs do run comparative helmet testing and publish rankings. Where that testing exists it is genuinely useful and worth reading. We have not done it, we have not read the underlying protocols closely enough to reproduce their conclusions, and we are not going to relay a ranking as though it were ours.

Where rotational systems sit relative to the standards

Outside them. Neither ASTM F2040 nor EN 1077 requires a rotational-impact system, and a helmet without one is fully certified. The standards test straight impacts; a rotational liner addresses angled ones, which is a different mechanism and one the standards do not currently cover.

That is why it appears as a separate line in our scoring rather than being folded into certification, and why it costs about 88 cents a day on the helmets we compared. The full explanation is here.

Helmets from other sports

• Bike helmets are certified to a different standard, cover less of the head at the back and sides, have no ear coverage, and are vented for warm weather. Not a substitute.
• Skate helmets are certified for multiple impacts at lower speeds and cover a different area again. Some helmets carry both a snow and a skate certification, and where they do, the maker publishes both.
• Snowboard helmets are ski helmets. Same standards, same tests, different styling. Full comparison here.

When to replace one

The two rules here outrank every feature comparison on this site.

• After any impact you noticed. The foam liner protects by crushing, and crushed foam does not crush again. The shell can look perfect over a liner that has already spent itself, which is exactly why you cannot judge this by eye.
• Never buy or accept a used one. Same reason: you cannot see whether it has already done its job. This is the one hand-me-down to refuse.

Absent an impact, makers commonly suggest replacement every few years as the foam and the retention system age. They do not agree on an interval, so we do not publish one as though they did. If the dial no longer holds or the strap webbing is frayed, that is your answer regardless of the date.

Checking a helmet you already own

Look inside the shell, usually under the removable ear pads or the liner. The certification is printed on a sticker or molded into the shell along with the date of manufacture. If there is nothing there naming a standard, treat it as uncertified.

If it does name one and it fits, you may not need a new helmet at all, which is worth checking before reading any roundup. Where you do, the adult picks are here and the children’s picks here.