"Plastic is like, uh. Like metal but nowhere near as strong. We'd use it for the helmet because unlike metal, it'll distort and expel the kinetic energy if you ever happened to crash. You know, instead of that happening to your skull."

Welcome to Physics 101 with Isaac Clarke.

"Whenever you find something, just show it to me. I'll tell you if it's what we want or not."

With that, Isaac turns back to the Junk Pile and starts sifting through the trash while wondering exactly how he's going to put all the materials together. Part of him somewhat hopes they just find a helmet in working order while another wants an opportunity to try and build one with the limited material just to see if he can.