It’s easy to think that a helmet fits well in the shop, only to realise that it doesn’t fit at all when you start riding.

Your helmet should fit your head snugly; there shouldn’t be any pressure points, or big gaps, and it shouldn’t wobble around when you move your head.

There should be as small a gap as possible between your goggles and helmet, and if it keeps slipping back, making the gap bigger, then it’s probably to big.

Of course, if it’s a bit big, you can pad it out by wearing a beanie, or the extra padding that usually comes with a new helmet, but if the back of the helmet rests on the back of your neck, this usually means it’s too big which can be really dangerous if you have a nasty fall.

If it keeps moving around even with a beanie or extra padding, try going a size smaller.

Boa systems can be really useful if you’re struggling to find a good fit, and mean that you have a little bit of versatility in size if you want to wear different beanies underneath.