An ill-fitting helmet can result in injury, so it’s important to measure your head correctly before you start trying different styles on. Helmet sizes are measured in centimetres – so take a tape measure and wrap it around your head, about an inch above your eyebrows, to find the circumference i.e. your helmet size.
Your ski helmet should cover your forehead and finish just above your goggles. Most helmets are adjustable, so you’ll be able to tighten and loosen it until you find a snug-but-comfortable fit for you.
Lastly, adjust the chin strap so it sits under your chin. You shouldn’t be able to get your finger through it too easily but it shouldn’t dig into your skin either.
Check it’s the right fit for you by shaking your head, or pushing the helmet from side to side with the flat of your hand while you’re wearing it. It shouldn’t move, so if it does, it’s too big.