Helmet construction varies by model. Petzl's BOREO uses a thick ABS shell with EPP and EPS foam and weighs 300 or 330 g by size; its SIROCCO uses EPP and EPS foam under a thin polycarbonate crown and is listed at 170 g. Compare exact fit, coverage, certification and instructions rather than assuming a construction name guarantees a result.
Climbing helmets use different shell and foam combinations. Compare model-level construction and fit, not a generic label alone.
Manufacturer examples
| Example | Published construction | Published weight |
|---|---|---|
| Petzl BOREO | Thick ABS shell with EPP and EPS foam liner | 300 g in S/M; 330 g in M/L |
| Petzl SIROCCO | EPP side foam and EPS top foam under a thin polycarbonate crown | 170 g in the listed configuration |
These are manufacturer examples, not universal rules for every helmet in either category. Other makes and models use different materials, weights and coverage.
Decide by model, not label
Compare a helmet’s approved activity, size range, stable fit, head coverage, ventilation and any model-specific impact features. A shell or foam description does not establish that a helmet is suitable for climbing; read the exact product label and manual.
For sizing, certifications and inspection, see our climbing helmet fit and certification guide. Browse ropes and protection.
Common questions
What is a hybrid climbing helmet?
Construction labels vary. Petzl describes its BOREO as a hybrid with an ABS shell and EPP/EPS foam liner; check the exact helmet's materials and manual.
Are foam climbing helmets lighter?
Some foam-forward models are lighter than some ABS-shell models. Compare the exact model and size; the materials alone do not tell the full weight.
Which helmet construction should I choose?
Start with a proper fit and an activity label for climbing, then compare exact model weight, coverage, ventilation and care instructions.
Does a helmet's shell type tell me its certification?
No. Read the product label for EN 12492, UIAA 106 or the specific certification the maker lists.