ThermoSuit

The ThermoSuit, borrowed from the Z-Series, is a special suit that astronauts wear in the Sagittarius program. It was only worn on Sagittarius 9 and 10, and the purpose of it was to put on after being on the moon, for heat protection in re-entry. The reason it was only worn on Sagittarius 9 and 10 is because they were the only ones that had weaker heat shields (to save weight).