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Motorcycle Helmet Sizing Guide: How to Measure, Choose, and Break In the Right Fit
- , by Damien Heenan
- 4 min reading time
How to Tell if Your Motorcycle Helmet Actually Fits
Every rider remembers their first helmet. It might’ve looked cool—but felt completely wrong. A helmet isn’t just another piece of gear; it’s your partner in protection, helping keep you safe ride after ride, mile after mile. So let’s walk through what it takes to find one that fits so well, you forget it’s even there.
Measuring Your Head: Getting It Right from the Start
We’ve all been tempted to just eyeball helmet sizes. But too many riders have ended up stuck on a long ride with a helmet clamping down like a vice. That’s the kind of distraction—and pain—no one needs. Measuring your head is simple and worth every second.
Grab a soft measuring tape and wrap it around your head just above your eyebrows—this is usually the widest part. Keep it level, snug, and comfortable. No soft tape? Use a string, then measure that with a ruler. Once you’ve got your number, compare it to the helmet brand’s sizing chart.
Choosing Your Helmet Size: Not All Sizes Fit Alike
Sizing charts typically range from XS to XXL, but here’s the thing—not all brands size the same way. And that’s just the beginning. Head shape plays a huge role in how a helmet actually feels.
Most helmets are built around three general shapes: round, intermediate oval, and long oval. But everyone’s head is a little different. You might find that one brand’s “intermediate oval” fits like a glove, while another’s feels too tight or awkward. That’s why trying on different helmets is key. It’s not just about circumference—it’s about how the helmet’s shape matches your anatomy.
If you're between sizes, here's a good rule of thumb:
- Within about 5 mm (roughly 3/16") of the smaller size? The padding will likely compress enough to give you a good fit.
- Closer to 6 mm (about 1/4") or more over? It’s usually smarter to size up to avoid pressure points or headaches.
Trying the helmet on is still the best test. Padding that feels slightly tight at first will usually mold to your head over time—getting better, not worse.
What the Perfect Helmet Fit Actually Feels Like
A properly fitted helmet feels like a firm handshake. Confident and secure, but not crushing. Here's what you should notice:
- Snug, even pressure around the crown of your head.
- Cheek pads that gently press your cheeks but don’t bite.
- Minimal shifting when you move your head side-to-side or up-and-down.
Quick Test: With the helmet on and the chin strap (retention system) secure, look in a mirror and hold the sides of the helmet. Nod up and down while keeping the helmet stationary, then turn side to side. If your facial skin moves with the helmet before it starts to shift, that indicates a snug or slightly tight fit. Wear it for 5–15 minutes—if it begins to feel more comfortable, you're likely in the right size. If not, try the next size up.
Signs Your Helmet’s Not Quite Right
Getting the fit wrong isn’t just uncomfortable—it can be dangerous. Here’s how to tell when something’s off:
Too Tight:
- Leaves red marks or deep indentations.
- Causes headaches or pressure.
- Creates uncomfortable hot spots.
Too Loose:
- Shifts or wiggles when you turn your head.
- Lacks stability at speed.
- Doesn’t maintain even contact around your skull.
Helmet Fit Matters—And It’s Not Just Comfort
Yes, comfort matters. But this is about protection too. A helmet that fits properly stays where it’s supposed to in a crash, spreading impact forces more evenly and reducing the risk of serious injury. One that’s too loose can shift or even come off entirely. That’s not a chance worth taking.
Breaking In Your Helmet: Give It Some Road Time
Just like a solid pair of riding boots, helmets need time to break in. Expect 10 to 20 hours of ride time for the interior padding to conform to your head. During that period, it may feel snug—but not painful.
Post Break-in Check: Reassess the fit after a few rides. A good helmet will still feel secure, but more naturally comfortable.
Bottom Line: Invest in the Perfect Helmet Fit
Finding the right fit isn’t just a one-and-done decision—it’s part of getting the most out of every ride. When your helmet fits right, you focus better, ride longer, and stay protected if the worst ever happens. So measure up, try a few on, and choose with confidence. The right helmet doesn’t just sit on your head—it works with you every mile of the way.
Looking for a new lid? Shop our full collection of motorcycle helmets here.
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