After taking this bag out on a few alpine trips, I have to say that I need a better (warmer) bag. I must admit that my legs get cold when I sleep (even at home), but this was ridiculous. Although the bag does have a draft collar, it does NOT have a draft tube, oops! Needless to say (I love that phrase) this will be the last bag I get that does not have a draft tube.

The first trip was a kayaking trip to Loon Lake where the temps got down to the mid to upper 20's. The cold was unbearable. Even though I was wearing fleece pants, two fleece tops, and socks, I still had to pile every piece of clothing, fabric, rope, drytop, wetsuit, etc. over my body and legs to stay warm. I never did sleep, I just laid awake all night shivering, for two nights.

The second trip was a fishing trip to Eagle Lake (where I limited out with some nice Eagle Lake trout). The temps dipped down to the low to mid 40's. While wearing fleece pants, TNF TKA 100 top, and an Icebreaker 260 top, I still managed to be cold. I finally threw a towel over my legs to get through the night.

I like the sleeping bag, but it just doesn't deliver on the temp rating. It is soft and cozy, yet big enough for me to roll around in (I am a side sleeper, 5'-8", 130lbs). The 20 degree rating may only apply to those people that can walk around all winter in shorts.

I own the regular size.

Used this in Patagonia in the Summer -- damp with temperatures down to around freezing. Wore quite a bit under it when sleeping in my tent -- leggings, thick socks, sweater down vest. But I sleep cold! Very comfortable in huts -- maybe around 50F. Maintained loft quite well in damp conditions. I would probably have gone with the next heaviest version for this trip, though. This is probably more ideal for 40F if you are a cold girl.

I really like this bag. The first time I crawled in it, I rolled over on my stomach and bent my knee off to the side comfortably. I guess it really just depends whether or not you're a side sleeper, but I tend to move around a lot and I was able to do so and not feel too constricted. (5'11, 190). I'm glad it has the draft tube and the neck guard, I think they'll make a difference when it counts.
I used it up on the saddle of Telescope peak in Death Valley where it probably got down to the 30's with the wind and woke up warm in the morning. The stuff sack that comes with it is pretty tiny, and it took me a bit of time to roll it up every morning, so I ended up investing in a bigger stuff sack. It's definitely a bag worth looking into.

I love this bag, I plan on moving on to down to save on weight, but this bag is a synthetic king. Super comfortable and nice and warm. I used it when the temps went down to 33 degrees with no issues. On top of a pad I was perfectly warm, I did not experience any issue with lack of insulation a in the legs. I wonder if the other viewers bag is defective, or perhaps its a cause of poor circulation? If weight was not my new major hiking campaign I would stick with this bag till it gave out, and it's constructed really well. Are there better bags - I don't know but mountain hardwear did right by me with the lamina.

The dudettes version of this bag is actually a little warmer than the dudes. A bloke of modest size (5'8" 175#, 70% of that being ego!) needs the women's long size. Thereby, if you can handle the colour, go the women's version instead. If you can't handle the colour, and are thinking about it too much - you might as well be a girl anyway, so still, go the women's version in a long length instead.

Hi my test of the Lamina 20 was at home in my house on a chilly night around 40 to 48 fahrenheit. I was not using a tent but I used a thermarest pad. To make a long story short there was plenty of room which was nice and the upper body insulation was effective. However from my knees down I was cold and my impression was that there was just not enough insulation there, especially in the foot box area. So imagine if I had been on the trail instead of my house and snow camping in 20 degree weather, the supposed rating for this bag, I never would have slept at all.
I think compared to a Marmot synthetic bag which is a bit bulkier and heavier, the lamina just does not compare.