In Starfield, you'll be visiting many planets, with some favoring life and others being inhabitable and hostile. In your exploration of the cosmos, you'll find yourself in extreme atmospheres and harsh weather conditions. And, what keeps you safe in these rogue conditions is your spacesuit. When your spacesuit's protection is depleted, you'll start taking damage and suffering from negative status effects.
Starfield: Suit Protection Depleted Explained
Your spacesuit is your protection in Starfield; understand why it depletes and upgrade it wisely to survive harsh conditions.