This jacket is made from Marmot's M3 material, this being the most breathable out of the three (M1, M2 and M3). It is lightweight and a very good fit. It has a good stretch to the fabric and the jacket doesn't ride up when your arms are above your head, making it ideal for climbing. The hood is big enough to be used over your climbing helmet and moves with your head when adjusted correctly with the draw chords. It offers resistance to light showers but anything more than that you will have to don Gore-tex. Thermally, it isn't the warmest jacket in the world but is ideal whilst on the move on the hill.
All in all i am impressed with this lightweight softshell, so much so i wear it pretty much everywhere. Only down point i could muster would be the price, i think it could be slightly cheaper, but then everything seems to be getting more expensive these days.