A helmet is one of the most important pieces of riding gear you’ll own, but finding the right one isn’t just about picking a style you like and choosing your usual size. A good helmet should fit securely, feel comfortable, and stay in place while you ride. Here’s how to make sure you get it right.

Your helmet should feel snug without being uncomfortable.

When it’s positioned correctly, it should sit level on your head rather than tilted backward, with the front of the helmet sitting roughly one to two finger widths above your eyebrows. Once it’s in position, tighten the rear retention dial until the helmet feels secure. You shouldn’t need to crank it down as tightly as possible. The goal is a firm, even fit around your head.

Give the helmet a gentle push from side to side and front to back. It should stay relatively stable rather than sliding freely around your head. Your chin strap should also be snug. A good rule of thumb is to leave enough room to comfortably fit one or two fingers between the strap and your chin.

Most importantly, pay attention to pressure points. If one area of the helmet is noticeably uncomfortable, even though the circumference is technically correct, that particular helmet shape may not be right for you.

Helmet sizing is normally based on the circumference of your head in centimeters.

Using a flexible measuring tape, wrap it around the widest part of your head. Start roughly an inch above your eyebrows and run the tape above your ears and around the back of your head.

Keep the tape level and snug, but don’t pull it excessively tight. Take the measurement a couple of times to make sure you’re getting a consistent result. Once you have your measurement, compare it with the sizing chart for the exact helmet you’re considering.

If you don’t have a flexible measuring tape, you can still get a good measurement.

Use a piece of string, a shoelace, a charging cable, or another flexible item that doesn’t stretch. Wrap it around your head in the same position, mark where the ends meet, then lay it flat and measure the length with a ruler or standard tape measure. It’s a simple trick, but it can save you from guessing your helmet size.

One of the biggest mistakes people make when buying a helmet is assuming that helmet sizes are universal.

They aren’t.

Brands such as IXS, Fox, Smith, and Giro each use their own sizing ranges, and sizing can sometimes vary between different models from the same manufacturer. That means wearing a medium in one helmet doesn’t automatically mean you’ll be a medium in another.

Your head shape matters too. Some helmets may feel better on narrower heads, while others offer more room through the sides.

That’s why your head measurement should always be your starting point, followed by the sizing chart for the specific helmet you’re buying.

If your measurement falls between two sizes, check the manufacturer’s recommendation for that particular helmet.

Depending on the brand and model, you may be encouraged to size up or try both sizes. The important thing is not to force the wrong helmet to work.

If a smaller helmet creates uncomfortable pressure points and the larger helmet moves around excessively even after adjusting the retention system, another helmet model may simply suit your head shape better.

Full-face helmets should generally feel more secure than an open-face trail helmet.

The cheek pads should make firm contact with your face, and the helmet should move with your head when you turn or shake it. A brand-new full-face helmet can feel relatively snug at first, particularly through the cheek pads. Those pads may soften slightly with use.

However, snug and painful are two different things. If the helmet creates significant pressure points or headaches, it may not be the right size or shape.

Helmets don’t last forever.

The most important rule is simple: if your helmet has taken a significant impact, replace it. A helmet can suffer internal damage even when everything looks fine from the outside.

You should also inspect your helmet periodically for things like:

• Cracks in the shell
• Compressed or damaged foam
• Frayed or damaged straps
• Broken buckles
• Damaged retention systems
• Missing or deteriorated padding

Even helmets that have never been crashed will eventually need replacing. Materials can degrade over time through normal use, heat, sweat, UV exposure, and general wear. Because recommended replacement intervals vary between manufacturers, always check the guidance provided by the helmet brand.

Your helmet is designed to protect your head, so treat it accordingly.

Avoid casually dropping it onto hard surfaces or throwing heavy gear on top of it. Try not to leave your helmet sitting in extremely hot environments for extended periods, such as inside a hot vehicle.

When your helmet gets dirty, clean it using mild soap and water and allow it to air dry. Avoid harsh chemicals or solvents that could damage the materials. And while stuffing your gloves inside your helmet after every ride might be convenient, giving everything a chance to dry separately will help keep your helmet fresher for longer.

Finding the right helmet doesn't need to be complicated.

Measure your head, check the sizing chart for the exact helmet you’re buying, and make sure it feels secure once you put it on. A correctly fitted helmet should sit level, stay in place when you move your head, and feel snug without creating uncomfortable pressure points.

And remember: the size printed on the label is only the starting point. The best helmet is the one that properly fits your head.