There are five different parts for each set of armor:
Light armor weighs less than heavy armor at the cost of protection.
Heavy armor offers the most protection but also weighs a lot.
- Perfect Madness
There are some items in the game that are rare and one of a kind (meaning there is only one). It's probably a really good idea to pick these items up when you can, and as quick as you can because they will really benefit you in the long run.
The Fin Gleam is an enchanted Glass helmet that lets you breathe underwater. It has a night eye ability as well. You can find the Fin Gleam underwater just west of Anvil in the sea. You're going to have to walk right to the sea here. It might benefit you to set yourself a map marker on the little island of land, just off the shore to Anvil, right off to the west. You can't miss it. Once there, you're going to want to stand on top of that small bit of land, and jump into the sea. If you look underwater from that very spot, you should see a small group of rocks that strongly resembles the shape of a hand, if it were just bone. What you want to do is swim down and look in, what would be, the thumb joint. There you should see a Skeleton, and next to the Skeleton should be a Glass helmet. Don't worry about drowning. Once you know where the helmet is you'll have just enough time to swim down, find it and put it on.
Once equipped your oxygen will be restored and it'll never drain once you have the helmet equipped.
This helmet is essential for anything that features an underwater scenario. It is especially helpful if you're in search of the Giant Slaughterfish that resides in Bravil Lake, which can be accessed by both the Wizard's Grotto during the Thieves Guild questline, or by swimming down into Bravil Lake itself and locating a hidden trapdoor that leads straight to an alternative tunnel, leading you straight to the Giant Slaughterfish itself.