Water-resistant, windproof, synthetic.
I got this jacket when I noticed that it was only taking a year for me to destroy a nice down jacket -even when I was trying to be gentle with it. But I'm primarily a rock climber-- so I use my jackets to approach (with a pack); I get caught out in the rain. I sweat in them, belay in them, get them dirty, and generally degrade them.
So that's where this one comes in- it's thinner than a down, so fits nicely with a pack on. Because it's windproof, it's also surprisingly warm. And it fits/ moves nicely, so it can even be used to run during the winter.
I'd definitely recommend this to a friend, and look forward to keeping my down jackets much nicer and less trashed!!!