The MOOSE unit was attached to the back of a maximum protection pressure suit not unlike the kind worn during space walks. The unit contained oxygen tanks, a rudimentary sighting system, a small rocket pack, as well as some basic survival supplies. The back of it — which was also at the astronaut’s back — had a quarter-inch thick heat shield made of GE’s Elastomeric Shield Material shaped like a shallow. Filled with rigid foam, it became a lifeboat. Here’s how GE imagined it saving a man from dying in space.
Source: The Wearable Reentry Spacecraft of Yesteryear – Vintage Space : Vintage Space