How to Choose a Helmet Head Shape | Round vs Intermediate vs Long Oval
Motocross helmets are molded in one of three head shape profiles: round oval, intermediate oval, and long oval. Buy the wrong profile and the helmet will create pressure points that make it unwearable, even if the circumference size is correct. Here is how to figure out your head shape and match it to the right helmet.
What Head Shape Means (and Why It Matters)
Head shape describes the geometry of your skull when viewed from above. Specifically, it is the ratio of front-to-back length to left-to-right width. A rounder skull has a higher width-to-length ratio. A longer skull has a lower ratio, meaning more front-to-back depth relative to width.
Helmet shells are designed around one of these three profiles:
Round oval: Wider relative to front-to-back length. The left-to-right width is close to the same dimension as the front-to-back measurement. Common in Asian-heritage populations and in some European head shapes.
Intermediate oval: The most common profile in the US market. Slightly longer front-to-back than it is wide. Most major motocross helmet brands design their primary shells around this profile because it fits the largest percentage of North American riders.
Long oval: Significantly longer front-to-back than it is wide. Riders with long oval heads frequently experience temple pressure in helmets designed for intermediate or round oval profiles.
How to Determine Your Head Shape
You need a mirror and a way to view the top of your head, or a second person. Look down at the top of your head or have someone photograph it from directly above. Sketch or mentally note the outline.
A round oval head looks nearly circular from above. The front-to-back and side-to-side dimensions are very close in length. An intermediate oval looks like a slightly stretched oval, longer front-to-back than it is wide. A long oval is noticeably elongated front-to-back, looking egg-shaped when viewed from above.
If you are between shapes, lean toward the longer profile. A helmet designed for a rounder head will create temple pressure on a longer head, which is immediately uncomfortable and worsens with time. Pressure on the temples causes headaches during extended sessions and makes riders want to loosen their chin strap, which is a safety problem.
Which Helmets Fit Which Head Shapes
Round Oval: Narrower Shell Construction
Round oval riders need helmets with a wider, more circular interior. Brands and models that tend to fit round oval heads include the 6D ATR-3 and the Leatt Moto 8.5 series. The 6D ATR series uses an ODS (Omni-Directional Suspension) system that sits inside a roomy outer shell, which accommodates rounder head profiles well. Browse the 6D motocross helmet collection at BTO for current availability.
Intermediate Oval: The Majority of the Market
If you have an intermediate oval head, you have the most options. The Bell MX-10 MIPS, Fox V3, Fox V3 RS, Alpinestars SM10, Troy Lee Designs SE5, and the Fly Racing Formula helmet series are all designed around intermediate oval profiles. These are the helmets that dominate the Pro Motocross starting gate because the intermediate oval profile fits the widest range of riders.
For premium intermediate oval fits, the Fox Racing V3 RS and the Alpinestars SM10 are the top-shelf options. For value picks, the Bell MX-10 MIPS and Troy Lee Designs SE5 both deliver MIPS protection at a lower price point on the same shell profile.
Long Oval: Deeper Front-to-Back Construction
Long oval riders frequently find that helmets designed for intermediate oval profiles create uncomfortable pressure at the temples. The Shoei VFX-EVO is known in the motocross community as one of the better fits for long oval heads. The Arai VX-Pro4 is another long oval-friendly option. Both brands use a more elongated internal cavity than most domestic motocross helmet brands. At BTO, explore the full motocross helmet collection and use the fit criteria described here to narrow your search.
The Trial Method: How to Confirm Your Head Shape at Home
If you have access to a tape measure, take two measurements. First: the circumference measurement (around the widest part of the head, one inch above the brows). Second: the front-to-back measurement from the center of the forehead to the most protruding point at the back of the skull. Third: the left-to-right measurement from temple to temple at the widest point.
Compare your front-to-back measurement to your left-to-right measurement. If they are within one centimeter of each other, you are likely round oval. If front-to-back is one to two centimeters longer, you are intermediate oval. If front-to-back is more than two centimeters longer than side-to-side, you are long oval.
The In-Person Fit Test
The only definitive answer comes from putting the helmet on. When you first seat the helmet on your head, it should create even pressure around the entire circumference. If you feel immediate pinching at the temples before even fastening the chin strap, the helmet is running too narrow for your head profile. If the helmet rocks easily or creates no snug contact at the cheeks and forehead, the profile is too wide.
Wear the helmet for five minutes before making a final decision. Mild initial tightness that relaxes is normal. Tightness that stays or intensifies, especially at the temples, means the profile is wrong. Do not buy a helmet you cannot test for at least a few minutes. Many retailers, including BTO's brick-and-mortar location, allow fit checks before purchase. See BTO's retail store for location details.
Head Shape and Youth Riders
Head shape matters for youth riders too, but most major youth motocross helmet brands design their youth shells around an intermediate oval profile by default. If your child consistently complains about temple pain in helmets that otherwise size correctly, consider that their head may be running long oval and try a different brand's shell. Youth helmet fitting is covered in more detail in the Youth Motocross Helmet Size Guide.
Head Shape vs Helmet Fit: What to Prioritize
Buy head shape first, then size. A helmet in the right shape that runs slightly large can often be corrected with thicker cheek pads, which most premium helmet brands sell as accessories. A helmet in the wrong shape cannot be corrected. Temple pressure does not go away with use. It either stays the same or gets worse as the liner compresses in other areas. Get the shape right and then dial in the size.
Shop Motocross Helmets at BTO Sports
BTO Sports carries the full range of motocross helmets across all head profiles. The Fox Racing helmet collection, Bell helmet collection, Alpinestars helmet collection, 6D helmet collection, and Troy Lee Designs helmet collection are all available at BTO. For sizing help, see the sizing guide. For helmet care and replacement timing, read When to Replace Your Helmet, Boots, and Gear.