The Petzl Vertex Vent is a comfortable and durable helmet with ventilation, meets requirements for working at height (note: provides no protection from electrical hazards). Features: Chinstrap designed to reduce the risk of the helmet coming off as a result of an impact during a fall : it has a breaking strength greater than 50 daN (EN 12 492 mountaineering helmet standard). Polycarbonate shell, resistant to impact and wear (meets EN 397 industrial helmet standard and EN 12492 standard). Ventilation holes that can be closed with sliding shutters (for cold and/or windy conditions). Meets optional requirements of the EN 397 standard: lateral deformation, use at low temperatures (down to - 30 °C). Does not meet optional requirements of the EN 397 standard regarding: Electrical insulation Molten metal splash (due to the ventilation holes). Customizable: side slots for mounting hearing and/or eye protection, the cut of the shell contours over the ears to fit standard hearing protection, four headlamp clips. Complete and simple adjustment: single headband size adjustment wheel, quick and precise to manipulate even while wearing gloves, height adjustment of the headband to adjust the position of the straps on the neck, chinstrap buckles can be adjusted forwards and backwards. Comfortable: Webbing suspension system, thick, replaceable foam headband. The headband retracts into the shell for storage. Certifications: CE EN 12 492, ANSI Z89.1 - 2003, Type I class C Specs: Headband Fits: 53 to 63 cm Weight: 465 grams Colors: Red, Yellow, White, Orange, Black