Petzl Sirocco Ultralight Helmet



Item #: 331511040

With a maximum weight of 165g, the SIROCCO helmet sets a new standard for lightness. The one-piece construction minimizes helmet weight while retaining excellent impact resistance, due to the mechanical properties of expanded polypropylene (EPP). The textile adjustment system also contributes to its lightness. This helmet comes with a new magnetic buckle which allows the chinstrap to be fastened with one hand. The SIROCCO helmet also has excellent ventilation distributed around the helmet.

NOTE: Find in Store Inventory levels are continuously changing. Please contact store to confirm availability is as shown.


  • One-piece crown of expanded polypropylene (EPP) and textile adjustment system for an ultra-lightweight product
  • Excellent ventilation distributed around the crown
  • Entirely adjustable and adapts to all head shapes
  • Removable comfort foam is quilted and lined with absorbent fabric; washable
  • Magnetic buckle allows the chinstrap to be fastened with one hand (Petzl patent)
  • Two mounting holes for VIZION visor
  • Two hooks and rear elastic for attaching a headlamp
  • Available in two sizes


  • Weight: 150 g (size 1), 165 g (size 2)
  • Fits head circumferences: 48-56 cm (size 1), 53-61 cm (size 2)
  • CE EN 12492, UIAA Certified

Shipping Info:

  • Leaves the warehouse in 1-7 business days depending on order volume.
  • Items may be returned within 60 days of the order date to an Atmosphere retail store or an Atmosphere warehouse. Items must be returned unused/unworn and electronics unopened. See Online Return Policy and Return Instructions for more information.
  • Note: Shipping restrictions may apply based on location and product size.


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