You’ll be looking for a climbing specific helmet that’s been certified. Bike and skateboard helmets won’t cut it as they’re not designed to cope with falling objects, plus you’ll look like an absolute gumby if you rock up with one of these lids.There are hard-shell helmets which feature a hard plastic outer and thin foam suspended underneath and foam helmets that are constructed in a way more similar to bike helmets.Both do a neat job but have different benefits. Hard shells are generally cheaper and more durable (they’re harder to crush) while foam is lighter and usually breathes better.