Silva Free 2000 M True Lumen Headlamp 8.8deal It allows quick and easy Size:M (32 33") It allows quick and easy clicking in and out of the pole and is compatible with all Shark poles The ergonomic battery holder is designed to hold the battery steady on the back of your head – but can be detached and replaced by the back cable guide if you want to keep your headlamp clean and simple – either solution lets you carry the battery in your pocket to keep the weight off your head helmet mounts and GoPro mounts are also available as accessories to your Silva Free headlamp as well as extra long extension cables and top band We invented the airflow technology and included an integrated aluminum cooler in the design because we wanted you to have great light regardless of what activity you do