Currently tier 2 thermal suit needs tier 2 thermal cloth to be crafted. When it's done, the tier 1 thermal suit becomes obsolete, without any use. And mining all that cobaltum on Phobos is long because the moon doesn't have caves.

So I suggest to modify the recipe by replacing one of the tier 2 thermal cloth by the tier 1 part. For example:

Only the boots will still need its 4 thermal clothes, and put the tier 1 boots between them:

For me it makes more sense since:

• tier 1 is useless when you get tier 2, and will just take space in chests. So with this craft we won't drop it in chests.
• it looks more like an upgrade tier 1 -> tier 2
• less cobaltum mining, but still need all the ressources from tier 1

Hope you'll like it :)

Ok, added.