body kit material, c-one kit Options

[elvasoshexai]

i emailed bulletproof auto a while back and they told me genuine c-one kits are made of fiber glass also... not sure if this is true or if the sales got it wrong... but if it is, i'd assume c-one fg is a lot higher quality than say vis?

so, i was wondering, how do these fiber glass compare to the vis zyclone kit? do they still crack and become almost glass-like in the winter? or are they able to flex and not crack when you hit something?

also, how do they compare to polyeurthane kits like the gt-4 bumper?

thanks