Petzl Elios Club Helmet MAXIMUM DURABILITY: The ELIOS has a lightweight, durable shell of injected ABS. COMFORT IS KEY: Features sliding shutters to adjust ventilation. BUCKLE UP: Adjustment buckles that are placed to the sides, away from the chin. TOTALLY ADJUSTABLE: Quick and easy headband adjustment, even while the helmet is being worn. FITS YOUR SPORT: The ELIOS is suitable for climbing, mountaineering, caving, via ferrata, canyoning. Headlamp can be attached using the four integrated clips.