Originally Posted by
Boudicca
I also blow the thermarest up as firm as I can. It's the only way it sort of works.
That is definitely not my experience. I find that the key is to get the pressure just right, but definitely not as firm as I can get it. It is extremely easy to get too much air in it. I usually blow it up a bit firm and then let air out until I almost bottom out. Different strokes though.