Bigger and lined with non-slip silicone, the helmet headlamp is specifically designed for any type of helmet. Whether it's rock climbing, bike riding, or any hardhat-wearing activities, this light will accommodate your helmet easily. The rechargeable LED Helmet Headlamp Set by One80 gives you a full 180 degrees of visibility so you can see it all. It is fully waterproof and easy to add to removed components. This helmet headlamp makes it super simple to keep a spare battery pack on hand and swap it out as needed for any time you find yourself tucked away in a dark place for an extended period of time. So super lightweight at 5 oz, you'll forget it's securely strapped to your helmet.