The space suit worn by Apollo astronauts on the Moon was called the Apollo/Saturn spacesuit, officially known as the Extravehicular Mobility Unit (EMU). It was designed to provide a pressurized, temperature-controlled environment for the astronauts while they were outside the spacecraft, and to protect them from the extreme temperatures and radiation of the lunar surface.

The Apollo/Saturn spacesuit was made up of several layers, including a pressure garment, a thermal layer, a micrometeoroid shield, and an outer layer. The pressure garment was made of a rubberized nylon fabric and was designed to maintain a pressure of 3.8 pounds per square inch (psi). The thermal layer was made of a polyester fabric and was designed to insulate the astronauts from the cold temperatures of the lunar surface. The micrometeoroid shield was made of a fiberglass fabric and was designed to protect the astronauts from small pieces of debris that could be flying through space. The outer layer was made of a nomex fabric and was designed to protect the astronauts from the Sun's radiation.

The Apollo/Saturn spacesuit also had a number of features that made it possible for the astronauts to move around and work on the lunar surface. These features included a helmet with a visor, gloves, and boots. The helmet was equipped with a microphone and a speaker so that the astronauts could communicate with each other. The gloves were made of a leather-like material and were designed to protect the astronauts' hands from the cold temperatures of the lunar surface. The boots were made of a rubber-like material and were designed to provide the astronauts with traction on the lunar surface.

The Apollo/Saturn spacesuit was a complex and sophisticated piece of equipment that was essential to the success of the Apollo missions. It allowed the astronauts to explore the lunar surface and to perform tasks such as collecting samples, setting up experiments, and planting the American flag.