In Starfield, players will have three pieces of gear that makes up their spacesuit, all of which give defenses and bonus effects. One of these pieces is your helmet, which provides you with vital breathing air when exploring hostile planets.
Starfield: How To Equip A Helmet
In Starfield, your helmet is a key piece of your spacesuit making sure you can breathe in space and add some protection from pesky spacers.
