Kiwi Climberwrote a review of Mountain Hardwear Ultralamina 15 Sleeping Bag: 15 Degree Synthetic on October 2, 2008
I bought this bag for summer alpine trips when the temp is unlikely to dip below 15deg F in New Zealand. First time I used it the temp was about 60F - too hot for this bag and since there is no way to vent your feet I cooked. Next trip it was around 40 deg. Only just warm - this is the bags lower comfort limit. Then I went snow caving - temp 32F - wore 3 layers, hat, 2 sleeping mats & wrapped a down jacket over my hips. I reckon this is near the bag's extreme limit. So much for 15F rating! There is a reason why this bag is lighter than it's competitors. It's not as warm. Bring on the European bag rating system.