Spacesuits are considered to be ‘personal spacecraft’ designed to keep a human alive in the harsh environment of space. Inside spacesuits, astronauts have the oxygen they need to breathe and the water they need to drink. Astronauts put on their spacesuits several hours before a spacewalk.
NASA astronauts wear what’s called an EMU (extravehicular mobility unit), which includes a protective white suit and a strap-on pack that provides oxygen and other life support necessities.
The suit consists of about 14 layers, within which there are three assemblies- (1) the liquid cooling garment which protects the astronauts from overheating; (2) the pressure garment to retain air pressure within the suit and (3) the thermal micrometeoroid garment to protect them from the sun’s radiation and to deflect space debris.
Picture Credit : Google