Thermal Tuning - Glitchfiend/ToughAsNails GitHub Wiki
Thermal Tuning is a treasure enchantment available for Chestplates. It cannot be obtained from an enchanting table, and is found the same way that other treasure enchantments are (Enchanted books from chest loot, etc.)
A Chestplate with Thermal Tuning will completely neutralize the player's body temperature, regardless of the current environmental temperature.