Green Mountain Bike Helmets

Think about the terrain and how much coverage you need: half-shells give lighter weight and ventilation for XC and trail climbs, 3/4 shells like Dropframe add rear and temple protection for aggressive enduro riding, and full-face helmets include a chin bar for downhill and high-speed courses. Try them on to confirm extended occipital coverage and goggle/visor fit.

If your head measures 58cm you’ll most likely fit a medium in brands that offer multiple shell sizes, since many MTB helmets cover the 51–61cm range. Use an adjustable system like a BOA dial and check there are no pressure points while confirming full cheek coverage.

Convertible helmets can be safe for enduro when the chin bar is securely attached, as they combine half-shell versatility with full-face protection for bike park or aggressive descents. Favor models that pair a removable chin bar with rotational protection like MIPS or Wavecel for added oblique-impact management.

Expect varied trade-offs: lightweight cross-country shells can be as light as about 250g with lots of vents, while full-face downhill shells can weigh 1200g or more and use fewer, larger openings. Materials like EPS liners and polycarbonate or carbon fiber shells influence both airflow and overall mass, so choose based on how much climbing versus descending you do.

Look for ASTM F1952 for downhill racing and the common CPSC or EN 1078 standards for general use; many modern helmets also meet e-bike requirements and include rotational systems like MIPS Integra Split. Models such as Smith Mainline combine Koroyd and MIPS with ASTM DH certification, and race-focused designs like the Speedframe RS have higher Virginia Tech ratings for extra confidence.