Freezing my *** off in a sleeping bag?

I have a sleeping bag that is described as a 3 season bag.

It has the following temp range (in celsius)

Temperature Range: (Comfort) -1°C (Upper Limit)+14°C
Extreme Capability: -12°C

Yet, I spent the night in my bedroom where it was maybe 9C ish min, and I was freezing my *** off. The sleeping bag was on an air matt, and I was pretty much just t-short / boxers, but still ... shouldn't I have felt warm? Is the rating assuming you are fully clothed whilst in the thing?

I want to feel toasty warm when I'm in it.

PhilinNWfla2012-05-11T05:00:55Z

Favorite Answer

You need more than a tee shirt. I would replace the air mattress with a couple of cardboard layers with aluminum foil sandwiched between then throw a blanket on top of it or find a fat chick.