Giro Fathom helmet review

It may be marketed as a mountain bike helmet, but that shouldn’t put you off putting the Giro Fathom through its paces on the road.

Cycling Weekly Verdict

The Giro Fathom is a great helmet which will happily adorn your head year-round thanks to excellent ventilation and adjustability. It could perhaps be a little lighter, but 280g not too bad for a lid of this price.

Reasons to buy
  • +

    Good ventilation

  • +


  • +

    Great fit

  • +

Reasons to avoid
  • -

    A little heavy

  • -

    Long chin straps

  • -

You can trust Cycling Weekly. Our team of experts put in hard miles testing cycling tech and will always share honest, unbiased advice to help you choose. Find out more about how we test.

The mountain bike section of the local bike shop may be uncharted territory for many of you, but it may be worth exploring in search of the Giro Fathom helmet. And once you’ve disposed of the label (and possibly the visor) there’s little to suggest that road riding is not the Fathom’s intended discipline.

For warmer rides, the ventilation is excellent thanks to the 23 vents, which allow plenty of cool air in, and the recessed channels flowing backwards from the front of the helmet, which ensure this cool air flows over the top of the head.

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Henry Robertshaw began his time at Cycling Weekly working with the tech team, writing reviews, buying guides and appearing in videos advising on how to dress for the seasons. He later moved over to the news team, where his work focused on the professional peloton as well as legislation and provision for cycling. He's since moved his career in a new direction, with a role at the Department for Environment, Food and Rural Affairs.