To make a slotted mid-headgear, you need one of the base materials, Contact Lenses  (AGI category) and Glasses  (INT category). Each of these items can be acquired through a quest, starting in the Geffen Bar. These quests are for making headgear specified on the Headgear Ingredients Page. Item Requirements: See Slotted Sunglasses on the Headgear Ingredients Page. This quest or event is Items in Ragnarok Online. Orc Hero Helm Quest · Zealotus Mask Quest · Slotted Sunglasses Quest. Actually, on some servers they have the quest. I'm too lazy to post a screenshot, but it's a lady in the upper-middle part of Alberta. She tells you.