Ok, so I keep hearing & seeing all these posts about Cuben Fiber this & CF that. What's the point of CF? I get that it's marginally lighter than ripstop, but why the extreme cost & all the hype? I've seen CF mitts, CF added to UQ's, etc.

Is it the same type material as kevlar? Is it much more durable than ripstop? Is it waterproof and breathable like Goretex or eVent?

Why have I seen it as an 'inner layer' on an incubator? If it's better than ripstop as far as durability or waterproofness, why not make the whole UQ out of it?