It can be found here:
Last winter when us rookie Americans kept missing the last Midi tram off the mountain at the end of the day we had few options. The Loo or the walk over to the Cosmic hut. Being on a budget we would stay in the Loo unless the tram crew kicked us out because of the bad weather and over crowding.
Even in the Loo it was a miserable night for the most part. Not very comfortable with no gear and colder than I would have liked but not the typical -30C it was hitting outside either.
I think it was the second night up there that I started dropping the Cirrus in my ruck as my "last" layer. And it did make a big difference in the grand scheme of things. I was comfortable with that last layer when I hadn't been previous. Less than a pound and worth every penny. I would have used it a lot more this summer and fall if my plans had worked out. My only complaint was this particular one was in black. Hard to get good pictures with a black jacket :) More so if you only use it climbing at night or on an uncomfortable bivy. When and where the jacket did get used is high praise though for a garment designed just for those exact kind of instances.
Here is why it is so good:
It has a great hood, that does fit over a helmet, and a stand up collar in addition to that hood. The fit is relaxed so I could easily layer under it. Slick as well so nothing to hang up when layered. And it all stuffs into one of the side pockets easily for packing. As good as it gets for materials and insulation when a lot of the 60g jackets have gone to Primaloft Eco, Brooks didn't dummie down this jacket.
•Insulation: Primaloft One®, 60g/m2
•Shell Fabric: 15 denier Pertex™
14.7 oz on my scale for a XL
No joke, layer six is a Brooks-Range Cirro. The Midi upper station Loo, 2am, Feb 2011.
60g of Primaloft One and 2 layers of Pertex are enough to make a stark difference when it is cold.