Petzl Swift RL Headlamp Blue, One Size

At 3. 5oz, the Swift RL Headlamp is Petzl's lightest, smallest light with Reactive Lighting, and we are huge fans. Catching attention from trail runners, ski mountaineers, and mountain bikers, Reactive Lighting analyzes ambient light to automatically adjust the headlamp's brightness to the amount necessary in any given moment. It brightens when you're staring down an extremely dark rappel and dims on sunset runs up sharp switchbacks or as the sun rises during dawn patrol or alpine starts.