#2 on this list
Sirocco
Petzl
The Petzl Sirocco redefined the ultralight climbing helmet category and remains the standard against which all fast-and-light head protection is measured. Weighing only 5.6 ounces in size small/medium, it is so light that climbers frequently forget they have it on. It is designed primarily for alpinists, long-route trad climbers, and weight-obsessed sport climbers pushing their personal limits on steep rock. Construction relies almost entirely on high-density EPP foam, topped with an ultra-thin polycarbonate crown plate that guards against overhead strikes. EPP possesses high elasticity, meaning it can absorb and recover from minor impacts that would permanently crush traditional EPS foam. The minimalist webbing harness uses thin straps and a magnetic or low-profile buckle, eliminating bulky plastic click-wheels. Large vents line the circumference, making this one of the coolest-running helmets in high heat. The trade-offs are specialized. The minimalist webbing adjustment system can be finicky to dial in with gloved hands, requiring patience at the base of a route. Additionally, while the EPP foam is remarkably durable, the bare foam aesthetic and lack of a full protective shell make it susceptible to cosmetic scratches, pack pressure damage, and heavy wear if mistreated in transit. **Highlights** - Unrivaled 5.6-ounce ultralight weight - Monoblock EPP construction with protective polycarbonate crown - Extensive open venting for superior heat regulation - Minimalist webbing harness packs down completely flat - Petzl enhanced top-and-side impact rating **Watch-outs** - Webbing suspension requires deliberate two-handed adjustment - Foam exterior easily incurs minor cosmetic scrapes
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#3 on this list
Capitan
Black Diamond
The Black Diamond Capitan is built for climbers who prioritize pure durability and structural toughness over shaving ounces. Constructed with a beefy two-piece ABS outer shell that wraps around a dual-density foam core of EPP and EPS, the Capitan is engineered to take severe punishment. It is ideal for rough cragging, wide off-width thrashing, and beginner climbers looking for a dependable helmet that will withstand years of heavy gear-bag abuse. Performance in the field aligns with its burly profile. By surrounding the EPP foam entirely in hard ABS plastic, Black Diamond addresses the common complaint of fragile, ding-prone foam shells. The helmet meets rigorous requirements for side and back protection, offering comprehensive coverage during unexpected, tumbling falls. The suspension uses an intuitive dial-adjustment system at the back, allowing quick resizing when donning a beanie or balaclava in changing conditions. The clear downside is heft. At roughly 11.3 ounces, the Capitan sits at the heavier end of modern climbing helmets. Climbers moving fast on long alpine approaches or those seeking featherweight performance will notice the additional mass on their neck over a twelve-hour day, and ventilation is notably more restricted than on foam-dominant models. **Highlights** - Robust two-piece ABS hardshell construction - Dual-density EPP and EPS inner foam liner - High level of side and rear coverage - Quick-adjusting rear ratchet dial system - Solid value around $90 **Watch-outs** - Substantially heavier than hybrid foam alternatives - Reduced airflow on hot, sun-exposed crag days
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Specs side by side
| Spec | Sirocco | Capitan |
|---|---|---|
| Weight | 5.6 oz (size S/M) | — |
| Core Material | Expanded polypropylene (EPP) foam | — |
| Crown Protection | Polycarbonate top plate | — |
| Suspension Type | Minimalist adjustable webbing harness | — |
| Standard Price | Approximately $170 | — |
| Impact Certification | Petzl Top and Side Protection protocol | — |
| Shell Type | — | Two-piece ABS hardshell |
| Liner Foam | — | Dual-density EPP and EPS |
| Stated Weight | — | 11.3 oz / 320 g (Size S/M) |
| Adjustment System | — | Low-profile rear ratchet dial |
| Coverage Spec | — | Enhanced side and back protection |
| Approximate Price | — | $90 |
What our reviewers liked and didn't
Sirocco
- Exceptionally low weight of 5.6 ounces in size S/M
- Generous vent openings deliver class-leading heat dissipation
- EPP foam construction resists fracturing under minor impacts
- Flat-folding webbing harness stows cleanly without rigid bulk
- Exposed foam body is prone to cosmetic dents and abrasions
- Webbing adjustment requires two-handed tuning and lacks a wheel
- Premium price point reflects specialized ultralight engineering
Capitan
- Resilient ABS hardshell resists everyday drops and pack crushing
- Dual-density EPP and EPS foam delivers comprehensive side and rear protection
- Low-maintenance construction offers exceptional service longevity
- Straightforward rear ratchet dial allows easy one-handed fit adjustments
- Weighs significantly more than lightweight hybrid and all-foam models
- Limited venting leads to warmth during hot, sun-exposed crag days
- Bulkier shell profile feels slightly cumbersome in narrow features
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