THIS is the Armor Goal right here, as (Until you hit Wolf Armor) this offers and INSANE leap from 8 armor with Bronze to 14 armor with Iron, PER PIECE. Although Iron isn’t the most easy to grind for, you need a Swamp Key and a *couple* of good crypts to get all the Iron you need, it’s a must have set when you have enough!
Iron Armor does have a negative 5% movement speed on each piece, so it can definitely slow you down, but you can also do the classic “Strip Naked so you run really fast when you’re not fighting but when you do get into a fight quickly put it all back on” maneuver. CLASSIC.
By the way, if you’re looking for a way to get a ton of Iron fast, check out:
Iron Farming Guide