Answer:
It is a common and favored clothing material among biker gangs and superheroes.
Break it and it gets better, immediately set and harder to break again.
A tiny bead, like fragile glass, strung along a cord of grass.
These are the bumpy parts of your digits
If you drop me I'm sure to crack. But give me a smile and I'll always smile back.
I touch the Earth, I touch the sky, but if I touch you, you’ll likely die. What am I?