A ski helmet only protects you if it fits. Too loose and it can shift or come off in a fall; too tight and it gives you a headache by lunch. The good news is that sizing a ski or snowboard helmet takes two minutes and a soft tape measure. This guide shows you how to measure, how to read a size chart, and how to check the fit for adults and kids.
Step 1: Measure your head
- Use a soft tailor's tape measure. If you don't have one, wrap a piece of string around your head and measure the string against a ruler.
- Place the tape about 1 inch (2.5 cm) above your eyebrows and ears, around the widest part of the back of your head.
- Keep the tape level and snug, not tight. Take the measurement twice and use the larger number.
- For kids, have them stand still and look straight ahead. A second adult helps.
Step 2: Match your measurement to the size chart
Every brand sizes a little differently, so always use the chart for the helmet you're buying. Here is the size chart for the MOUNTALK Ski Helmet & Goggles Set:
| Size | Head circumference | Usually fits |
|---|---|---|
| S | 48–54 cm / 19–21 in | Kids about 5–14, petite women |
| M | 55–59 cm / 21–23 in | Most women and teens |
| L | 60–63 cm / 23–24.8 in | Most men |
Sizes M and L come with an extra set of 8 mm comfort pads, so you can fine-tune the fit. If you're between two sizes, choose the smaller one and use the dial at the back to adjust.
Step 3: Check the fit when you try it on
Once the helmet arrives, run through these quick checks before you hit the slopes:
- Position: the front edge should sit level, about one finger-width above your eyebrows. It shouldn't tilt back to expose your forehead.
- Snug all around: with the dial loosened, the helmet should already feel close to your head with no big gaps. Then tighten the dial until it's snug but comfortable.
- The shake test: with the chin strap open, shake your head side to side and nod. The helmet should move with your head, not slide around.
- Chin strap: buckle it so you can fit about one finger between the strap and your chin. It should not pinch or choke.
- No pressure points: wear it for 10 minutes indoors. Any sharp pressure spot, especially on the forehead, usually means the size or shape is wrong.
Don't forget the goggles
A common problem is the "gaper gap": a strip of bare forehead between the helmet and goggles. It's cold, it can sunburn, and it usually means the helmet and goggles don't fit together. Try your goggles on with the helmet. The goggle frame should sit flush against the helmet's front edge, and the strap should sit comfortably in the goggle clip at the back.
The MOUNTALK set comes with matching OTG goggles designed to sit flush with the helmet, and they fit over most prescription glasses.
Sizing ski helmets for kids
- Buy for today's head, not next year's. A helmet bought "to grow into" will sit loose and may not protect properly. Most kids' heads grow slowly after age 5, and an adjustable dial gives a little room.
- Measure every season. Re-measure at the start of each winter and check the fit with the shake test.
- Hats go off. Kids shouldn't wear a beanie under a helmet; it changes the fit. A thin balaclava or helmet liner is fine if the helmet still passes the fit check.
- Make it theirs. Let kids pick the color. A helmet they like is a helmet they'll actually wear.
What about safety standards?
In the US, look for a ski or snowboard helmet certified to ASTM F2040, the standard for recreational snow sports helmets. The MOUNTALK ski helmet is ASTM F2040 certified, with a lightweight in-mold shell and EPS liner. A bike helmet is not a substitute for a ski helmet; see snow helmet vs ski helmet for how different helmet types compare.
When to replace your ski helmet
Replace a helmet after any significant impact, even if you can't see damage. The foam liner is designed to compress once. Also replace it if the shell is cracked, the liner is crumbling, the straps or buckle are damaged, or the helmet no longer fits.
Frequently asked questions
Should a ski helmet be tight?
It should be snug, not tight. It shouldn't move when you shake your head, but it also shouldn't leave red marks or cause a headache.
What if my head measures between two sizes?
Choose the smaller size and use the dial and pads to fine-tune the fit. A helmet that's slightly snug will usually settle a little; one that's loose won't get tighter.
Can adults with small heads wear a size S?
Yes. Size S (48–54 cm) fits many petite women and smaller adults as well as kids. Go by the measurement, not the age.
Do I need a different size for snowboarding?
No. Ski and snowboard helmets are sized the same way, and the same helmet works for both.
Ready to find your size?
Measure your head, check the chart above and choose your color in the MOUNTALK Ski Helmet & Goggles Set, or browse all snow gear. For more tips, read our snow helmet buying guide.
