The Leather Helmet was part of the second tier armour set. They provided better overall protection than their tier 1, Cloth, counterparts. This was especially true when it came to protection from Radiation.
The helmet could be obtained in three different ways:
The helmet could be crafted using 7 Leather. Doing so would take 10 seconds and yielded one helmet.
To learn how to craft them the player has to either obtain it's corresponding Blueprint from Rad Animals or use a Research Kit. When using the Research Kit method, the player had to drag the Research Kit onto the helmet with one Paper in their inventory.