The oxygen from the life support system comes into the suit through the helmet and flows over the astronaut’s face for cooling and to push the humidity and carbon dioxide exhaled by the astronaut out of the helmet and into the suit.
The helmet has additional visors that can be pulled down for further protection. A gold-covered visor can be pulled down to act like a pair of sunglasses. There are also separate visors on the right, left, and top that can be partially pulled down to block out the sun.