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Members of the Slitheen family used compression fields in their collars to allow them to wear human skins and disguise themselves. However, this had the side effect of frequent gas expulsion. Initially, it was limited to large people. (TV: Aliens of London/World War Three) Compression field technology soon advanced to the point where they could fit inside the skins of thinner humans and life forms the size of footballs. Also the gas exchange issue was fixed. (TV: The Lost Boy, PROSE: The Monsters Inside)