Why is it the top-selling headlamp in the world? It's the most balanced headlamp in the world!

The Petzl Zoom Headlamp is one of the top selling headlamps in the world. One of the biggest reasons is the design: The weight in front of the lamp is in perfect balance with the weight of the battery at back of your head. This allows for complete hands free use (with other less than ideally-balanced headlamps you'll always have to pause and make minor adjustments) while you're hiking camping climbing or spelunking. A zoom bezel allows you to adjust the width of the light to best suit your needs.