Petzl Sirocco Review

Overview

The Petzl Sirocco is a certified climbing and mountaineering helmet that weighs about as much as a full-size smartphone. It swaps the usual hard plastic shell for a molded foam body with a polycarbonate-capped crown, and it is built for alpinists, ski mountaineers and long-approach climbers who count grams. The trade-off is durability: exposed foam dents and scuffs in ways a hardshell doesn’t, and it costs $169.95.

Key Specs

Spec	Details
Weight	160–170 g depending on size
Construction	Hybrid: EPP foam shell with a rigid EPS-injected crown capped in polycarbonate
Materials	Polycarbonate, EPP and EPS foam, polyester webbing
Certification	EN 12492 (also CE, UKCA, UIAA)
Sizes	S/M (48–58 cm), M/L (53–61 cm)
Buckle	Minimalist magnetic chinstrap buckle
Adjustment	Webbing headband and chinstrap, cinch-style rear adjustment
Headlamp compatible	Yes: two front hooks and a rear elastic
Face shield	Compatible with Petzl Vizion (sold separately)
Price	$169.95

Performance

Weight and carry. This is the Sirocco’s entire pitch, and reviewers agree it delivers. Outdoor Gear Lab named it the lightest helmet in its climbing-helmet test and gave it the Top Pick for weight. UKC’s reviewer called it the lightest helmet he had ever worn. Nail the Trail’s reviewer found it weighs less than half of the hardshell it replaced. Owners describe forgetting it is on, and on a day with a long talus approach or a hot slog to the base of a route, that matters more than a spec table suggests. The thin straps and low profile also make it compact to stow, and it clips to a pack without dominating it.

Protection. The current design is a hybrid. The original all-foam Sirocco gave way to a version with a polycarbonate crown over injected EPS, the area most exposed to falling rock and ice, while softer, more resilient EPP covers the sides and back. Petzl cut the helmet lower in the rear and extended the side coverage. Outdoor Gear Lab’s testers praised that combination of resilient EPP and a tougher plate on top. The Sirocco is certified to EN 12492 for climbing, but it is not a ski or bike helmet.

Durability. This is where the Sirocco asks for care. Exposed foam is susceptible to puncture, according to Outdoor Gear Lab, and a long-term owner on Trailspace reported that dragging it across rock leaves scuffs and small dents. EPP does spring back from minor knocks, and the same owner judged that the marks didn’t compromise strength, but a helmet that spends its life crammed in a haul bag with ice tools and cams will age quickly. Skiers using it note that a hardshell is still the better choice for rougher duty.

Comfort and ventilation. Testers rate both highly. Large vents run along each side, and small foam pads sit at the brow and crown. Outdoor Gear Lab found it deeper and more head-shaped than shallower, rounder competitors, and Peak Mountaineering’s reviewer likened the fit to Petzl’s Meteor, minus the weight.

Adjustment and buckle. The rear cinch system works well once learned but is less intuitive than a ratcheting dial. Testers note it is harder to operate in thick gloves, which matters on ice. The magnetic buckle allows one-handed fastening, though owners say it can occasionally stick or pick up grit.

Headlamp and ice use. The hooks and rear elastic hold a headlamp securely, and the elastic doubles as a goggle keeper for ski missions. Compatibility with the Vizion eye shield makes the Sirocco a credible ice-climbing helmet when spray and chips are in play.

Choosing a Version

Only two things change between the S/M and M/L: the head range and about 10 g. S/M fits 48–58 cm heads and weighs 160 g; M/L fits 53–61 cm and weighs 170 g. The ranges overlap from 53 to 58 cm, which covers many adult heads, and that is where the choice gets decided.

• S/M: Best for smaller heads and anyone under about 55 cm, as well as climbers who want to wear a beanie or thin liner underneath without running out of adjustment.
• M/L: Best for larger heads and for anyone near the top of the overlap. One owner measuring 57 cm judged M/L the right call over S/M.

Fit deserves care. At least one REI buyer found even the M/L too narrow, especially compared with Black Diamond’s Vapor. Climbers with wide or long-oval heads should try one on before committing.

Pros & Cons

Pros

• Among the lightest certified climbing helmets, at 160–170 g
• Vents are large, and airflow is excellent
• Hybrid construction adds crown protection and rear and side coverage
• One-handed magnetic buckle
• Secure headlamp attachment and Vizion shield compatibility
• Packs small and clips easily

Cons

• Expensive at $169.95
• Exposed foam dents, scuffs and can be punctured
• Cinch adjustment is fiddly with gloves
• Magnetic buckle can stick or collect grit
• Can run narrow for some heads

Who Should Buy This

The Sirocco suits alpinists, ski mountaineers, multi-pitch climbers with long approaches, and thru-hiker types who carry a helmet for the occasional via ferrata or scramble. Anyone who wears a helmet for hours at a time will appreciate the weight. Gym climbers, guides and instructors, and anyone who regularly tosses a helmet into a rough gear bag should look at a hardshell like Petzl’s Boreo or a comparable model, which costs less and tolerates abuse better.

Verdict

The Sirocco is the helmet to buy when weight is the priority and the owner is willing to treat it with some care. It earns its price in comfort and ventilation on long days, and the hybrid design closes most of the protection gaps of the original all-foam version. Climbers who abuse their gear should save money and carry the extra 150 g or so of a hardshell.