The exo skin is a high-level accessory that offers the player complete immunity from environmental dangers like acid and lava in any form (including acid rain on unpurified temperate worlds and ash rain in hell biomes), crystals, spikes, and stalagmites/stalactites. When not equipped, this item is in the Accessories section of inventory.
How to Obtain
The only way to obtain an exo skin is to purchase it in the crowns store. This item is not tradable.
How to Use
Drag the exo skin into an active slot in your Accessories Bar to equip it.
Exo Skins were a new addition with the 1.13.0 release of the game.