A berserker helm is members' headgear with decent defence bonuses. To wear it, a player must have 45 Defence and have completed The Fremennik Trials. After the Evolution of Combat, its stats were surpassed by the rune full helm.
With the second Summoning update, a player can have Pikkupstix in Taverley enchant the helm with 35 summoning, at which point it becomes a berserker helm (e) and can hold up to 70 scrolls. When charged it takes on a lighter colour and becomes a berserker helm (charged).
Many players prefer the helm of neitiznot over the berserker helm, because the helm of neitiznot has better defence with a prayer bonus, as well as costing slightly less than the berserker helm, and also can be obtained free from completing The Fremennik Isles.