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BioLite's HeadLamp 425 boasts a one-of-a-kind fit thanks to its award-winning 3D SlimFit Construction. Unlike any other headlamp you've tried, its front profile is a mere 10mm and it weighs just 78 grams, ensuring a snug and secure fit without bouncing or slipping. The moisture-wicking fabric keeps you cool and dry during any activity, while the rechargeable battery eliminates the need for disposable alkaline batteries.