PETZL's A010CA02 VERTEX vent helmet (red) features an adjustable-strength chinstrap for both work at height and on the ground. It has ventilation holes with sliding shutters to allow airflow through the helmet. With its potential for integration of a Petzl headlamp, hearing protection and multiple accessories, it is an entirely modular helmet, thus responding to the specific additional needs of professionals. Head circumference: 53 – 63 cm. Certification(s): CE, EN 397, EN 12492, ANSI Z89.1 Type I Class C, EAC.