3/4 Helmet vs Half Helmet: Which Should You Buy?
3/4 Helmet vs Half Helmet: Which Should You Buy?
For most street riders we'd buy the 3/4 helmet. It covers your ears, the sides of your head, and the back of your skull, and most 3/4 designs work with a visor or shield, while a half helmet covers little more than the top of your head. A half helmet still makes sense for short, slow, hot-weather rides if you accept that trade. Both types can carry a legitimate DOT label, so the choice comes down to coverage, comfort, and how you ride.
A half helmet is the minimum: shell over the crown, ears and face exposed. A 3/4 helmet adds ear, side, and rear coverage and usually has room for a face shield or built-in visor. Neither has a chin bar. Pick the 3/4 if you ride above city speeds or ride often; pick a half helmet only if airflow and minimal bulk matter more to you than coverage.
We read the federal helmet standard, FMVSS No. 218 on eCFR, for the coverage, projection, and labeling rules. Eye protection points come from the Virginia DMV eye and face protection guide, and state law context from the IIHS motorcycle helmet laws table. Product details come only from the R18 product page. We didn't impact-test anything, and we don't compare crash outcomes between the two types.
What Each Helmet Actually Covers
Put one of each on a table and the difference is obvious. The half helmet is a bowl. The 3/4 wraps down around your ears and the back of your head and stops at your jawline, leaving your face open.
| Area | Half Helmet | 3/4 Helmet |
|---|---|---|
| Top of head | Covered | Covered |
| Ears and temples | Exposed on most designs | Covered |
| Back of skull | Partly covered | Covered down toward the neck |
| Eyes and face | Open; you add glasses or goggles | Open, but most designs take a shield or have a built-in visor |
| Chin and jaw | No chin bar | No chin bar |
| Bulk and airflow | Smallest, most air | Bigger, still airy |
That last row is the whole appeal of a half helmet. It's small, it's airy, and on a 95-degree afternoon it barely feels like you're wearing anything. Every other row is what you give up for that feeling.
Yes, Both Can Be DOT Certified. Here's Why
A lot of riders assume a half helmet can't be "real" DOT. It can. FMVSS No. 218 defines the protected area in terms of a test line on the headform: the helmet has to provide a continuous protective surface at and above that line. It doesn't require the shell to cover your ears, cheeks, or chin.
So a well-made half helmet and a well-made 3/4 can both pass. What the label doesn't tell you is how much of your head sits outside that required zone, and on a half helmet that's a lot more.
The same standard also gives you a way to spot fakes. Look for:
- A DOT label on the outside of the shell reading "DOT", "FMVSS No. 218", and "CERTIFIED", along with the manufacturer's name and model.
- A permanent label inside listing the manufacturer, size, month and year of manufacture, and materials.
- No rigid spikes or decorations sticking out. The standard limits rigid projections on the outer surface to 5 mm.
The standard also sets a minimum field of side vision, so a legitimate helmet of either type shouldn't box in your view. A paper-thin "novelty" half helmet with a stick-on DOT sticker and no inside label is the one to walk away from.
Where the Half Helmet Wins
We're not going to pretend half helmets have no case. They're easy to pull on and off, they fit in more saddlebags and under more scooter seats, and they give you the most open, connected feeling you can get while still wearing a DOT helmet.
If your riding is a three-mile hop to the coffee shop on a cruiser, in summer, on 30 mph streets, a half helmet and a good pair of wrap-around glasses is a combination plenty of riders are happy with.
Say you ride a vintage bike to a weekend meet 10 minutes away. You'll park, walk around, and carry the helmet for an hour. A half helmet hooked on your bike's helmet lock is less annoying than a 3/4 swinging from your hand. That's a fair reason to choose one, as long as you know what it doesn't cover.
Where the 3/4 Helmet Wins
Most of the everyday advantages go to the 3/4. Your ears and the sides of your head sit inside the shell instead of hanging out in the wind. The back of your head is covered further down. And you can ride with a shield.
That shield point is bigger than people think. The Virginia DMV says a plastic faceshield protects you from wind, dust, rain, insects, and stones, and it also says a windshield is no substitute because most windshields won't keep wind out of your eyes. Glasses alone won't stop your eyes from watering and can blow off when you turn your head. On a half helmet, glasses or goggles are your only options.
Once your rides stretch past 20 minutes or your speed climbs past city limits, wind noise and fatigue start to matter. Covered ears cut the wind roar that wears you down on a long ride.
Say you commute 25 minutes each way, including a stretch at 50 mph. With a half helmet, you'd be riding with ears exposed to wind and relying on goggles. A 3/4 with a shield keeps the same open-face feel at lights while covering more of your head on the fast part.
What About the Law?
Helmet laws are set state by state. The IIHS table shows how different they are: some states require helmets for all riders, others only for younger riders, and some treat mopeds and low-powered scooters under separate rules. A certified half helmet and a certified 3/4 meet the same federal standard, so read your own state's wording to see exactly what it asks for.
Eye protection is a separate question, and that table doesn't cover it. If your state requires eye protection or a windscreen, check the specific rule on your state DMV site before you pick a half helmet and plan to rely on sunglasses.
A Quick Way to Decide
Short, slow, sunny rides. You hate bulk and love airflow, and you'll always wear real eye protection.
Daily riding, mixed speeds, cooler mornings, or you want a shield. The better default for most riders.
Regular highway miles or you want your jaw covered. A full face or modular helmet is the better fit.
A 3/4 That Gives You the Shield
If the shield is the reason you're moving up from a half helmet, make sure the 3/4 you buy actually has a clear one. Some retro 3/4s come with a tinted visor only, which leaves you back in goggles after dark. Check current availability on the product page before you order.
R18 Dual Visor Open Face Helmet
The product page lists a clear outer shield for wind, dust, insects, and debris, an internal sun visor for glare, a removable washable liner, and DOT FMVSS No. 218. Like any 3/4, it has no chin bar.
See R18 details3/4 vs Half Helmet FAQ
Is a 3/4 helmet better than a half helmet?
For most street riding, yes. It covers your ears, sides, and more of the back of your head, and most designs take a shield. A half helmet only wins on airflow and bulk.
Can a half helmet be DOT approved?
Yes. FMVSS No. 218 requires protection at and above a test line, not ear or chin coverage, so a well-made half helmet can be certified. Check for the outside DOT label and the permanent label inside.
How can I tell if a half helmet is a novelty helmet?
Look for a DOT label reading FMVSS No. 218 and CERTIFIED with the maker and model, plus a permanent inside label with size, date, and materials. Spikes over 5 mm or a missing inside label are red flags.
Does a 3/4 helmet protect your face?
A shield helps keep out wind, dust, rain, insects, and stones, but a 3/4 helmet has no chin bar. Your jaw is not covered by the shell.
Is a half helmet OK for highway riding?
It can be legal, but we wouldn't choose one for regular highway miles. Wind on exposed ears and eyes gets tiring fast, and a full face or modular helmet covers far more.
Do I need goggles with a half helmet?
You need some kind of real eye protection. Regular glasses can blow off and won't stop watering eyes, so wrap-around riding glasses or goggles are the better choice.
Are 3/4 helmets hotter than half helmets?
A little, because more of your head is covered. Both are much airier than a full face helmet, and on a 3/4 you can open the shield for extra air at low speed.
Final Notes
If you're torn, buy the 3/4. You keep the open-face feel and gain ear and side coverage. Choose a half helmet only when your rides are short, slow, and warm, and pair it with proper eye protection. Whichever you pick, check both DOT labels when it arrives and look up your state's helmet and eye protection rules.