Petzl Iko Core HeadtorchLightweight, ergonomic, rechargeable headlamp with AIRFIT headband. 500 lumens Bringing together multiple technologies! The IKO CORE rechargeable headlamp combines multiple technologies to provide 500 lumens at a total weight of only 79 g. Featuring an AIRFIT headband, an ultra thin lamp body, and an energy source worn in the rear, the headlamp is balanced and comfortable enough to be imperceptible. It is versatile and can also be worn around the neck