What are the main two functions of the head cushion in the KM37?

The head cushion in the KM37 serves important roles in both thermal protection and the reduction of dead air space. By providing thermal protection, the head cushion helps to insulate the diver’s head against cold water, which can be crucial for maintaining body temperature and comfort during dives. In underwater environments, maintaining warmth is essential as even mildly cold water can lead to hypothermia over time, especially during prolonged dives.

Additionally, the head cushion is designed to help minimize dead air space around the diver's head, which is vital for efficient breathing and overall safety. Dead air space can cause an increase in carbon dioxide levels if there is inadequate ventilation, which can be dangerous during a dive. The effective design of the head cushion ensures that these two functions are met, contributing to the overall effectiveness and safety of the diving system.