All modern models have special mounts for a headlamp on their bodies. These can be regular rubber bands or plastic clips. It is better to choose the second option since a rubber quickly deteriorates. All you need to do is pull the strap from your headlamp through these clips and tighten it so it doesn’t slide over your eyes. If you wish, you can purchase a special flashlight mount glued to a helmet with adhesive tape, which saves you from using straps.