Fremennik helm

Fremennik helms are a medium level helmet that can only be worn after completing the Fremennik Trials Quest. Fremennik helms are dropped by Fremennik guards and Dagannoths.

Bardur in Waterbirth Island dungeon will give a cooked Shark in exchange for a Fremennik helm, Fremennik blade or Fremennik shield.

The helm has the same bonuses as an Adamant full helmet. The helm cannot be traded, although it is possible to cast High Level Alchemy on it to obtain 3900 coins.

In the Summoning page it says that Fremennik helms are equipment that require 35 Summoning to wear, although it cannot be enchanted to hold scrolls and can be worn without 35 Summoning.