David L.wrote a review of Western Mountaineering UltraLite Sleeping Bag: 20 Degree Down on December 4, 2012
Familiarity: I've used it several times
I first bought the HighLite 35 degree bag, slept out in New York in November and was a bit cold, so I returned it and got the UltraLite. The bag is incredible- super warm, great construction, packs down very small. Expensive, but I expect it will last for decades.