The thermal regulation of a mountaineer is a constant battle. During the intense physical exertion of an ascent, the body generates a huge amount of heat and sweat. A poorly ventilated mountaineering helmet can trap this heat, leading to overheating and discomfort. At SPIRIT, we engineer our helmets to breathe. We use advanced modeling to design ventilation systems with large intake and exhaust ports, creating a passive airflow that pulls cool air over the scalp and pushes hot, moist air out. We carefully design the internal channels in the EPS foam to guide this airflow effectively. The challenge is to create these large vents without compromising the helmet's structural integrity. We do this by reinforcing the helmet's structure with an internal framework, ensuring it still provides complete protection. The result is a mountaineering helmet that keeps a climber cool and focused on the way up, contributing significantly to their overall performance and safety.