Answer:
What can you catch but not throw?
What goes up but never comes down?
It is more feared than fear itself, And no one can escape it. It takes no sides and does not judge, it does not know to hold a grudge. It is the most clearest result, Of how life beats you by default.
My first is in some but not in all. My second is into but not in tall. My third in little but no in big. My fourth in port but not in pig. My whole is made in nature's way. For clothing, rugs used every day.
You must keep this thing. Its loss will affect your brothers. For once yours is lost, it will soon be lost by others.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?