Helmets are a necessity on today’s ski slopes, yet it still happens that one is not aware of an approaching skier from behind (in particular when one listens to music on headphones), leading to potentially dangerous collisions. The SmartHelmet project should explore the use of multiple LIDAR sensors (e.g., the LIDAR Lite by PulsedLight) in order to provide skiers with visual (LEDs) and/or auditory (headphones) warning of skiers approaching from behind.