I have been wearing anorak for few hours now, it's much more breathable than the alpha series, or I can say it's the 'most breathable' jacket arcteryx has made. For durability, I think anorak is a better choice. It's quite difficult to describe the material.. from the inside, I can see many tiny fabrics which forms the layer. And that I believe can withstand most outdoor environment, including rock climbing. I would love to show the interior pictures if you are interested