Safety helmet for work at height, industrial activities and building construction. Lightweight helmet, comfortable and well ventilated with wheel adjustment system. Chinstrap designed to open in the event of suspension and prevent choking: it opens between 15 and 25 daN (conform to CE EN 397 standard). Size adjustment wheel easily handable even with gloves on. Shell with ventilation holes. Clips for mounting headlamps. Pre-drilled holes for the installation of the visor and ear muffs and radio. Internal webbing suspension system with removable and washable padding.