Experience top-tier performance with a fit unlike any headlamp you’ve experienced thanks to Biolite's proprietary 3D SlimFit Construction. With a front profile of only 9mm and weighing only 69g, the headlamp sits flush on the forehead without worry of bounce or slippage. Moisture-wicking fabric keeps you cool and dry for any activity and the rechargeable battery means you can leave the alkalines behind.