Cobalt Armor

Cobalt armor is an armor set that has been re-introduced in version 1.1 (having been removed in a previous update). The armor requires Cobalt Ore to be crafted, and is therefore blue in color. The helmet of the armor set also seems to have variations.

Old version
Cobalt armor was replaced by Jungle armor in 1.0.3 as a name and graphic swap (everything else is equivalent). Pieces of the Cobalt armor could not be crafted and instead were dropped randomly by Hornets in the Underground Jungle. Existing pieces of Cobalt armor that players owned were converted to Jungle armor when the patch was applied.