Answer:
It is a common and favored clothing material among biker gangs and superheroes.
What must be looked through in order to see?
What word becomes smaller when you add 2 letters to it?
Hot tempered and sometimes it blows its top, making a mess of everything.
You fill it and it empties, A metaphor for plenty, Depending on what half you see, It's either full or empty
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?