First all, I have to say, I love Western Mountaineering. Occasionally there are heroic companies in the outdoor world that push new boundaries. This is one of them. They make products that are both unbelievably light and well made at the same time. Kudos WM, I hope you never get too big you forget your niche.
Now back to the bag. This bag is the bomb. It weighs in at an incredulous 15 oz. and is respectably toasty to boot.
Its a down bag, that packs to almost nothing, and is rated to 35 Â°F. We've slept in it down to around 28 Â°F degrees wearing thermals. I was on the edge of cold, but mostly stayed warm.
This bag is an ultralight backpackers dream. The top 3 heavies are sleeping bag, tent and backpack and this almost eliminates one of those from the map.
The only downside? It's very spendy, at over $200! But IMHO, worth every penny. Save for this bag and you won't be disappointed.
Available from Backcountry Gear for $230.