What is an Item Durability?

Weapons and Clothes in this game aren't permanent. If you check your inventory, or your weapon shortcuts, you'll notice that there's a light blue bar beneath them. The bar represents their item durability.

If you use your weapon to fight, or perhaps for gathering resources, you use up its durability count. Once the bar gets depleted, your item will break therefore you need to get another. In regards to clothes, their durability count gets used whenever you get hit by enemies.

You can check how much durability is left for all your items in your inventory. Be careful when heading out and make sure you have enough available.