Black Diamond - Half Dome Climbing Helmet - 53-61cm Some wear and tear on the outer. The Black Diamond Half Dome is a hybrid construction climbing helmet designed for multipurpose use, including rock climbing, alpine climbing, and mountaineering. It features an EPS foam liner combined with a durable polycarbonate shell for impact protection. The design incorporates a one-handed fit adjustment dial at the rear, adjustable chin strap, and integrated headlamp clips to secure a light source for alpine starts or late finishes. The ventilation system utilizes a series of ports to maintain airflow during high-output activity.