Answer:
Against the sun I protect your eyes and am often worn on the face of spies
I always run but never walk often murmur but never talk have a bed but never sleep has a mouth but never eat.
I am in the middle of water but am not an island.
I look like a tiny trombone
Ripped from my ancestors home beaten and burned I become a bloodthirsty killer.
The warmer I am the fresher I am.