The rune helm is a medium helmet crafted from one rune bar, and is the best non-degradable medium helm available to free-to-play. To wear this helmet, the player needs at least 50 Defence. It is typically used by people who cannot afford a rune full helm, as the Evolution of Combat update removed the lesser negative offensive bonuses that separated it from its full helm counterpart.
It can be smithed using one rune bar, requiring a minimum Smithing level of 88 and granting 75 experience. Rune helms are often bought to be high alched for Magic experience.