Best Motorcycle Helmets for Big Heads (XL–3XL)

How to find motorcycle helmets that fit XL to 3XL heads properly, including which brands run large, how to measure correctly, and the best options by head shape.

Shopping for a motorcycle helmet when you measure above a 62cm head circumference — roughly XL in most brands — shifts the entire buying equation. Fewer models are available, internal shapes become more critical than ever, and the margin for error shrinks because you can't casually try on thirty options at a local shop the way a medium-head rider can. Here's how to navigate the big-head helmet market without overpaying for the wrong fit.

Why Head Shape Matters More Than Size

At standard sizes, a rider with a slightly mismatched head shape can sometimes get away with it because the comfort liner has enough compression range to adapt. At XL and above, that margin disappears. The EPS impact liner is thicker at larger sizes to maintain safety performance, which means the comfort liner is proportionally thinner — there's less foam to compress and conform. A shape mismatch at 2XL that would have been tolerable at Medium becomes a painful hot spot that no amount of break-in will resolve. Knowing whether your head is round oval, intermediate oval, or long oval is genuinely essential before spending money at this size range.

How to Measure Correctly

Wrap a soft measuring tape around your head at the widest point — typically just above your eyebrows and ears, around the largest circumference of the back of your skull. Take the measurement three times and use the largest number. Don't pull the tape tight enough to compress your skin; a firm but not squeezing tension gives the most accurate result. Common XL–3XL measurements and their typical size equivalents across major brands:

Helmets That Run Large

Some brands consistently produce helmets with roomier internal dimensions, which large-headed riders should prioritize. Scorpion helmets are well-known for running generous — their EXO line in particular offers more internal volume at each size step than most competitors. HJC's RPHA and i-series helmets tend toward a roomy intermediate oval that accommodates wider cheekbones and broader foreheads at XL and above. Arai's round-oval profile is the best match for riders with genuinely round, wide heads rather than oval-shaped heads, though Arai's sizing runs slightly smaller than the competition, so a rider who wears XL in Scorpion may need 2XL in Arai.

The Shell-Size Issue

Most helmet manufacturers produce two to four shell sizes across their full size range. A small and medium might share one shell, a large and XL share another, and 2XL and 3XL share the largest shell. This means a 2XL helmet may use the same outer shell as a 3XL, with only the internal liner thickness adjusted. The practical impact: if you're at the top of a shell-size bracket (say, a large 2XL that's almost a 3XL), you're getting the thinnest possible comfort liner inside the largest available shell, which can feel less snug and secure than you'd expect. Some premium brands — Arai, Shoei, AGV — use more shell sizes across their range, which generally provides better fit at extreme sizes.

Weight Considerations at Larger Sizes

A 3XL helmet weighs noticeably more than its Medium equivalent in the same model — often 150 to 250 grams more, depending on shell construction. That might not sound like much, but on a two-hour highway ride, the additional neck strain from a heavier helmet at a larger lever arm (bigger head = more rotational moment) is genuinely noticeable. Carbon-fiber and carbon-composite shell helmets save the most weight at large sizes, though they carry a significant price premium. If you're choosing between two helmets with similar features and fit, the lighter one will almost always be the better daily rider for a big-headed rider doing regular commuting or touring.

Ventilation at Larger Sizes

Larger helmets contain more internal volume that needs airflow to keep cool, but the vent openings are typically the same size as on smaller shells in the same model. Some riders with large heads find that helmets marketed as "well-ventilated" at standard sizes feel stuffy at XL and above simply because the airflow-to-volume ratio drops. Helmets with large chin vents, brow vents, and rear exhaust ports — like the Shoei RF-1400 and Scorpion EXO-R1 Air — handle this better than helmets that rely on small or few vent openings. If heat management is a priority, add ventilation performance to your evaluation criteria rather than assuming it scales proportionally with helmet size.

Modular vs. Full-Face for Big Heads

Modular helmets often fit large heads more comfortably during the process of putting the helmet on and taking it off, because the chin bar lifts out of the way and doesn't catch on your jawline or ears. Once closed, a quality modular should fit as securely as a full-face, but the wider opening makes daily use notably easier for riders with large heads or thick necks who struggle with the narrow opening of a standard full-face. Schuberth's C5 and Shoei's Neotec 3 are both available in XL–2XL with genuinely solid chin-bar locks that maintain structural integrity in the closed position.

What to Do Above 3XL

Above 67cm circumference, off-the-shelf options become extremely limited. A few brands — Simpson, Biltwell — produce helmets in 4XL for specific models, but the selection is narrow. Custom-fit helmets from companies that build to individual measurements exist but carry premium pricing and long lead times. Some riders in this range find success with open-face or three-quarter helmets, which accommodate larger heads more easily due to the absence of a chin bar, though the protection trade-off versus a full-face helmet is significant and should be weighed carefully.

Glasses Compatibility at Large Sizes

Riders who wear prescription glasses face an additional fit challenge at XL and above. The temples of your glasses need to slide between the comfort liner and the EPS shell without creating pressure points, and at larger helmet sizes, the available clearance can vary significantly between brands. Shoei's RF-1400 includes specific channels in the liner designed to accommodate glasses temples. Arai's comfort liners are generally accommodating due to their thicker, softer padding that compresses around glasses stems. Scorpion's EXO line is known for being eyeglass-friendly with roomy temple channels. If you wear glasses, bring them to every helmet fitting and test them with the chin strap fully fastened — the strap tension can shift the liner enough to change glasses pressure from acceptable to painful.

For the complete gear picture beyond helmets, see our Motorcycle Gear for Tall and Big Riders guide covering jackets, pants, gloves, and boots in extended sizes.

Frequently Asked Questions