The Petzl Vertex Vent work and rescue helmet is also ideal for those who practice caving and mountaineering. Vertex Vent is comfortable and ventilated, characterized by a fabric border and a six-point fastening that allows the helmet to adapt to the shape of the head and remain stable during the various maneuvers at altitude or on the ground. Centerfit adjustment takes place by operating the two side wheels. The system is easy and fast and allows the helmet to always remain well centered on the head. The helmet has Dual chinstrap that allows the worker to modify the chinstrap resistance to adapt the helmet to different environments: work at height (EN 12492) and ground work (EN 397), ventilation holes and doors sliding doors adjustable from the outside to ventilate the helmet according to the conditions of use. Petzl thinks of a completely modular helmet, compatible with various accessories: visor thanks to the two side attachments for the installation, frontal lamp thanks to the four clips for the hooking, chinstrap and interchangeable padding, hook for earmuffs. The helmet is available in one size adjustable from 53 to 63 cm. Vertex Vent is comfort, durability, stability and protection. Instructions. Petzl Vertex Vent helmet for work at height and rescue