When climbing the last thing you want is extra weight, but sometimes having a helmet is a good idea. Fortunately SIROCCO from Petzl has a compromise in mind with an ultra-lightweight brain bucket that is just 165 grams. It is features a monobloc construction that takes advantage of expanded polypropylene (EPP) to minimize the weight while still being able to provide excellent impact resistance.
And since having a free hand is a lot to ask for, and two free hands is often a luxury many climbers don’t have, the helmet’s magnetic buckle allows the chinstrap to be attached with one hand.