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Thermal Catsuits were invented by the ThunderCats in order to enable them to survive the freezing weather of the Caverns of Cold. This particular location on New Thundera is under the influence of the second moon of Plun-Darr, the same moon where Chilla hails from. Because of this, the area is characterized by extreme cold temperatures. The Catsuits help the ThunderCats to keep warm and maintain their normal body temperature.
Apart from blocking cold temperatures, the Thermal Catsuits also protect the ThunderCats from other harmful environmental aspects such as toxic swamps. Due to the water-tight properties of the suits, Lion-O, WilyKit and Snarfer wore them to protect themselves from the poisonous waters of Baleful Swamp