They’re not quite skinsuits, but someone is thinking ahead to what sort of suits future Mars settlers will need.
Wikipedia has a useful backgrounder on the skinsuit (aka “mechanical counterpressure suit” or “space activity suit”), which includes the basis for several details of how the concept is applied in In the Shadow of Ares. But if you’re more into a retro-look, Jeff Foust reviews of a new book on the development history of the Apollo lunar spacesuits.