A helmet is the one piece of riding gear where “close enough” isn’t good enough. If you have a large head, finding an XXL motorcycle helmet that fits properly can take some effort, because not every model goes that big. However, once you know your exact head size and a few fitting rules, the search gets much easier.
In this guide, we’ll explain what XXL means for helmets, how to measure your head, how to check the fit in a store, and which safety labels to look for in the US, the UK and Europe.
What Size Is an XXL Motorcycle Helmet?
At most major brands, an XXL motorcycle helmet fits a head circumference of 63 to 64 cm (about 24.8 to 25.2 inches). For instance, Arai’s size chart lists XXL as 63–64 and 3XL as 65–66. Similarly, The Helmet Shop’s chart overview shows that brands such as Shoei, Bell, Scorpion and Icon run from XS to 3XL, covering about 53 to 66 cm.
Helmet Size Chart: M to 3XL
| Size | Head (cm) | Head (in) | Approx. hat size |
|---|---|---|---|
| M | 57 – 58 | 22.4 – 22.8 | 7 1/8 – 7 1/4 |
| L | 59 – 60 | 23.2 – 23.6 | 7 3/8 – 7 1/2 |
| XL | 61 – 62 | 24.0 – 24.4 | 7 5/8 – 7 3/4 |
| XXL | 63 – 64 | 24.8 – 25.2 | 7 7/8 – 8 |
| 3XL | 65 – 66 | 25.6 – 26.0 | 8 1/8 – 8 1/4 |
Generally, each helmet size covers just 2 cm. That’s a much tighter range than clothing, so even a small measuring error can put you in the wrong size. If you already know your hat size, our XXL hat size guide explains how the two systems relate.
How to Measure Your Head for a Helmet
The NHTSA helmet guide recommends a simple method:
- First, use a soft cloth tape measure.
- Next, place it just above your eyebrows.
- Then wrap it around the widest part of the back of your head, keeping it level.
- Finally, measure twice and use the larger number. Compare it with the specific brand’s chart.
If you land exactly between XL and XXL, try both. After all, helmet liners compress slightly over time. Therefore, many riders choose the snugger of two sizes, as long as it doesn’t cause pressure points.
Head Shape Matters Too
Of course, size is only half of fit. Helmets also come in different internal shapes. According to NHTSA, the three main shapes are round oval, intermediate oval and long oval, and intermediate oval is the most common.
- Pressure on your forehead usually means the helmet is too round for your head.
- Pressure on the sides usually means it is too oval.
- Even, snug pressure all around is what you want.
So if an XXL feels tight in one spot and loose in another, the problem is probably shape, not size. In that case, try a different model rather than a bigger size.
How to Check the Fit of an XXL Motorcycle Helmet
- First, put the helmet on and fasten the strap. It should feel slightly tight, with even pressure and no hot spots.
- Shake your head gently from side to side. The helmet shouldn’t shift or slide.
- Push the helmet up from the chin. It shouldn’t roll back off your head.
- Finally, wear it for 30 to 45 minutes before riding, as NHTSA suggests, because pressure points may take time to show up.
Many full-face helmets also have replaceable cheek pads. As a result, a dealer can often fine-tune the fit without moving you to a different shell size.
Safety Labels to Look For
- United States: a DOT label on the back of the helmet, listing the brand, model, “DOT”, “FMVSS No. 218” and “CERTIFIED”.
- UK and Europe: an ECE 22.06 approval label, usually sewn into the chin strap.
- Warning signs: NHTSA warns that helmets weighing about a pound or less, with thin liners or plastic buckles, are often unsafe novelty helmets.
In short, never buy a helmet on size alone. Check the certification label, too.
Where to Find XXL and 3XL Helmets
Unfortunately, not every model is made in every size. Typically, premium touring and sport-touring helmets are more likely to offer XXL and 3XL shells. Also, brands such as HJC list sizes up to 5XL on some models. Therefore, filter by size first, and then choose a style.
Quick Answers
What size is a 64 cm head in helmets?
A 64 cm head is usually an XXL. However, at some brands it sits at the very top of XXL, so try 3XL as well.
Should a new helmet feel tight?
Yes, slightly. It should feel snug with even pressure, but it shouldn’t cause headaches or sharp pressure points.
Can I use a hat size to buy a helmet?
Only as a rough guide, because hat and helmet sizing differ. Always measure in centimeters and use the helmet brand’s own chart.
Choosing the Right XXL Motorcycle Helmet
To sum up, an XXL motorcycle helmet usually fits a 63 to 64 cm head. Measure carefully, match your head shape, test the fit for at least half an hour, and check for a DOT or ECE 22.06 label. Getting those details right matters far more than the brand name on the shell.
