Replace the helmet that took the hit
A helmet's foam works once. After a crash where the head hit, it is finished even if it looks fine. How to check, fit it, and get it worn.
Drawn from parents and riders arguing about helmets, including people describing crashes that the helmet turned from a disaster into a bruise, set against current US and UK guidance on fit, head injury and when a helmet is finished.
A bike helmet can look perfect and be useless. The part that protects your child’s head is the foam inside, and it works by crushing once. After that it does not spring back, and, as the CDC puts it, you may not be able to see the damage.
After any crash where your child’s head hit, replace the helmet, even if it looks undamaged, because the foam inside only works once.
Why a helmet is finished after one real hit
Many people say a helmet is single-use: once it has taken a real impact, the foam inside is compromised even if the shell looks untouched, and the helmet should be replaced straight away. The CDC’s helmet sheet, in the United States, says the same: the foam crushes in an impact, you may not be able to see it, and a crushed helmet cannot protect the head from the next one. The Bicycle Helmet Safety Institute, a US non-profit that studies helmets, puts the rule plainly: replace a helmet after any crash where the head hit. It adds a warning that matters with a child: when a helmet does its job, the rider often says they did not hit their head, or not hard, and the thin outer shell can hide a dent in the foam. The CDC’s sheet is simpler still: replace any bike helmet that is damaged or has been in a crash.
Some people explain how that works. The helmet absorbs the blow by giving way, shattering or crushing so the force spreads out instead of going into the skull. One person points out one detail. A helmet that broke into many pieces was not hit harder than one that cracked once; it was built to break along planned lines, and it did its job.
Two things to do with a helmet after a crash, one person each. Take it to the hospital with your child if they are being checked, because one person says staff can use it to judge how hard the fall was. And when you throw it away, cut the straps first, so that whoever finds it does not think it is still good. The institute says many makers will replace a crashed helmet for a small fee, so ask before you pay full price.
The first question below is for the helmet that was dropped rather than crashed, where the answer is to look hard.
Does it fit, and is it on properly?
A helmet worn wrong protects less. The warnings are short: the forehead has to be covered, the chin strap has to be buckled, and the helmet must not be loose or on backwards. One person says a helmet with the forehead showing loses its protection, and another that one with the chin strap undone flies off before the head hits the ground. One person’s conclusion is that the best helmet is the one your child will wear, every time.
The CDC’s checks, from its helmet sheet, are simple enough to do at the door:
- The front edge sits low: one or two fingers’ width above the eyebrows, not tipped back.
- The side straps make a V shape under each ear, slightly in front of it.
- The chin strap sits under the chin, snug, with room for no more than one or two fingers.
- Ask your child to yawn wide. The helmet should pull down on their head. If it does not, tighten the chin strap.
- Once it is buckled, it should not move backwards, forwards or side to side.
- Look inside for a label saying it meets the US Consumer Product Safety Commission standard, and for the date it was made. In the UK and Europe, the label shows the European standard (EN 1078) instead, which the UK kept after leaving the EU.
One correction matters if your child skates. A skateboard helmet is not automatically a bike helmet: skate helmets have softer padding, made for many small knocks, and are not built for the bigger hits of a bike fall unless they are certified for both. The CDC says the same about multi-use helmets: check for a label certifying it for biking before your child rides in it.
Price is not the thing to worry about. Some people say not to cheap out on a helmet, and to choose one that protects the back of the head, because riders often fall backwards. The Bicycle Helmet Safety Institute’s lab test of helmets sold in the US found that the basic impact protection of helmets costing about ten or twenty dollars equalled that of helmets costing over a hundred and fifty. More money buys an easier fit, more air vents and nicer looks. So a cheap helmet with the safety label, which fits, is not the risk; a helmet that does not fit, or is not on the head, is. One person remembers parents who once refused to buy helmets at all because of the cost. Choosing a size and a model is not covered here; the CDC sheet covers it.
Getting it on their head, and keeping it there
A helmet hanging off the handlebars protects nothing, and some people name that as the place it goes wrong. Here is what parents try, and where each one stops working.
Compliment the helmet. Many people say that when you praise a child’s helmet, the child feels proud of it and keeps putting it on, and that the praise has to be real and warm, or it sounds sarcastic. It has limits, and what decides them, people say, is the child’s age and temperament. One person says a five-year-old told that something is cool may do the opposite, as a dare. Some people say that from primary-school age up, other children and a parent’s example count for more than an adult’s compliment. One person warns that drawing attention to the helmet reminds a child that other children do not wear one, and says treating it as normal works better. Another compares it to being asked whether new trainers make you run faster: children notice when adults are making a point. One objection is that praise from an adult the child thinks is uncool can put them off the helmet. And one person says complimenting a stranger’s child is creepy, while another answers that simple praise for safety gear is not.
Wear one yourself. Some people say parents have to model it, because children copy what they see; one person compares it to not smoking in front of your children. One person points out that adults skip helmets to look cool, the same way children do. If you ride beside them without one, you may be teaching them that helmets are for children.
Say what the risk is. Many people say that looking a bit silly costs nothing next to a brain injury, and four that among serious riders a helmet is simply standard, not uncool. One person says explaining the real risks lets a child make their own choice, and that a choice lasts longer than pressure does. For a teenager, one person says a shrug, treating the helmet as nothing special, works better than praise. Another says telling your own story about a time a helmet saved you works better than a compliment.
Fear is the other method people argue about. In one conversation, some people say graphic pictures or hard consequences work better than praise, and two say praise builds the habit that lasts; what decides it, they say, is the child. Some people warn that shock tactics can frighten or backfire with some children, and that graphic material is too much for young ones. Some people say what makes the habit stick is seeing it: a near miss, a cracked helmet, or a friend or relative with a head injury. Smaller ideas, one person each: an adult joining in with the same gear, so the child is not the only one; friends who wear one; a joke about how cool the helmet makes them look; and, one person says, local police or community schemes that hand out a small treat, like an ice cream, to children seen wearing one.
What to do with a teenager who refuses outright is not covered here.
What the stories show, and what they cannot
Some people describe a crash where the helmet was the difference: on a bike, a motorbike, a scooter, a skateboard, a snowboard on ice, a dirt bike, running. One objection asks why a helmet matters if a driver is at fault; the answer given is that you cannot control other drivers, only how hurt you are when they get it wrong. Some people describe the other side, falls without a helmet that ended in a coma, permanent brain damage, or death.
Some people say a head injury can change a life years later: memory and thinking, seizures, holding down a job, even when the first tests came back clear. One person says brain injuries are unpredictable, with small falls ending badly and worse-looking ones turning out mild.
Two honest notes about these stories. One person points out that they come only from people who survived to tell them; the people who died without a helmet cannot tell theirs. And one person warns some of the stories here are second-hand, about a friend, so the details may have grown in the telling.
Who this page is not for
If the helmet in question is for a motorbike, the gear and the standards are different, and this page does not cover them; some people say doctors see the worst outcomes in motorbike crashes without a helmet, and two that full protective clothing, made for sliding along the road, matters there too. If you are an adult arguing about helmets on slow, separated bike paths, the fourth question below gives both sides of that argument and does not settle it.
And if your child has already been badly hurt, this page is not the one you need. One parent wrote after their son’s accident: the brain injury changed his mental health, badly enough that he needed hospital care, and the advice they were given was to listen and be there rather than to fix it. If they have just been hurt, the box at the top of this page comes first: 911 in the US or 999 in the UK. If a head injury has changed how your child thinks, feels or behaves, even long afterwards, that is worth raising with their doctor. And if your child or you are having thoughts of suicide, call or text 988 in the US, or call Samaritans free on 116 123 in the UK, any time; elsewhere, your local emergency number.
Common questions
It was only dropped, not crashed. Do I really need a new one?
Not automatically, but look hard before you decide. People split on it. Two say any drop or knock compromises a helmet, so replace it to be safe. One says a helmet dropped with no head inside it does not take the same force as a crash with a head in it, so use judgement. The Bicycle Helmet Safety Institute, a US non-profit that studies helmets, draws the line between them. After any crash where your head hit, replace it; no inspection needed. A drop is different: dropping a helmet on a hard surface can crack the foam, and the cracks may be small and hard to see, so look carefully, including under the thin outer shell. Any crack in the foam, any marks on the shell, any crushed patch at all, and it is finished. If you cannot tell, the institute says many makers will inspect a crashed helmet, and many will replace one for a small fee. One habit helps here, from some people: do not drop helmets on hard floors in the first place. The CDC’s helmet sheet adds: do not let anyone sit or lean on one.
How long does a helmet last if it never crashes?
People give different numbers, about five years or five to ten, and the reasons they give are sunlight, sweat and the padding drying out. One person points out age alone does nothing to a helmet kept somewhere cool, dry and dark, and that sunlight, knocks and sweat are what wear it; a helmet gone yellow has had too much sun. The outside checks move this again. According to the Bicycle Helmet Safety Institute, most makers now say to replace a helmet after five years. The institute says some of that may be marketing. “Helmet liner foam does not deteriorate with age,” it says; the safety standards do not permit a helmet that sweat breaks down; sunlight can weaken the shell. So the maker’s date is the careful rule, and any helmet that is cracked, crushed, yellowed or missing pads is finished whatever its age. The CDC’s sheet says to store it away from direct sun and never in a car, where it gets too hot. Two more reasons to replace one: it has no safety-standard sticker inside, which the institute says means replace it, or it no longer fits, which some people name. Growing children outgrow helmets. And one person cautions against used helmets, because you cannot know what they have hit; there is a page here on what never to buy secondhand.
Can we decorate it so they like it more?
Carefully. One person says decorated helmets, with soft hair, a unicorn horn or spikes, become something children want to show off, and draw more compliments from strangers. The correction people give is about what sticks out. A helmet is shaped to skid along the ground when it hits, and a spike or a grip fixed to it can catch instead, which risks the neck; one person tells of a fatal crash in which a spike mounted on a helmet broke through into the rider’s head. The firm warning people give is not to add anything that changes how a helmet absorbs a hit or slides. The CDC’s sheet goes further: do not paint a helmet or put stickers on it without checking with the maker first, because it can affect safety. The maker’s instructions or website will say what is allowed. A helmet your child chose themselves, in a colour they like, may get the same pride without the risk.
My child says nobody else wears one, and some countries don’t bother. Are they wrong?
People argue this one hard, and it is mostly an argument about adults. One side says good cycling streets, separated paths and slow traffic, as in the Netherlands, are what cut deaths, and that helmets matter less there; one person notes that death rates per distance cycled are lower in such places even without helmet laws. The other side says the road is still harder than a skull, and that falls come from debris, a broken part, a moment of distraction or a medical problem, none of which a good street removes. One person in Denmark says the claim that nobody in the Netherlands wears a helmet is an exaggeration, and that helmets are more common in Denmark on similar streets. What decides it, as one exchange here puts it, is whether you are asking about a whole country’s road deaths, where streets win, or about one person’s head in one fall, where the helmet does. Two more honest points. A bicycle helmet is built for falling onto the ground; one person points out that it was never designed for a high-speed hit from a car, and others answer that whatever knocks you off, you still land on the same road. And some people object that a short, slow ride is not worth the bother; the answers given describe slow falls, one at about two miles an hour, that ended in serious injury or death. For a child on a bike, a fall onto the ground is exactly the case the helmet was made for.
Questions this step helps with
Same situation, another step
- Let the kids call out the bikesParenting
- Take the photo before you go inParenting
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