Since 1963, NASA has adopted the Gemini suits, the first real spacesuits.
Made from a pressurized suit for high altitude flight, it could be used inside and outside the spacecraft. It was composed of 8 layers of nylon and nomex, a fireproof material, to which, during operations outside the vehicle, an additional “coat” could be superimposed resistant to cosmic dust, radiation and micrometeorites. On Earth it weighed about 18 kg.
In the photo: Gus Grissom and John Young in their Gemini suits connected to a portable air conditioning system, essential to guarantee occupants a comfortable temperature.