SAFETY AND ROBUSTNESS: High-quality materials offer optimum protection thanks to their high mechanical strength at a very low weight. The extremely robust helmet shell offers high and complete head protection. COMFORTABLE CLIMATE: To ensure a pleasant climate inside the helmet, the HPS 3500 is equipped with a ventilation system. It can be closed if necessary to protect against the ingress of firefighting water, sparks and metal shavings. The interior is made of skin-friendly, hypoallergenic, sweat-resistant and breathable materials.