From RimWorld Wiki
The following table lists each category of armor by the type of damage it protects against. Clothing and armor will have one or more of these protective properties. Some are intrinsic to certain creatures (i.e. turtles, centipedes).
|Blunt||Armor - Blunt||Protection against blunt damage like club attacks, rock falls, and explosions.|
|Piercing||Armor - Piercing||Protection against piercing damage like bullets, knife stabs, and animal bites.|
|Heat||Armor - Heat||Protection against temperature-related damage like burns.|
|Electric||Armor - Electric||Protection against electric damage like EMP pulses.|
|Toxic||Armor - Toxic||Protection against toxic damage.|