I have an EXPED SIM 2.5 sleeping mat. Full price is similar to Thermarest but i got mine in a sale. This is a light weight self inflating sleep mat. but i have been very disapointed in it. It lasted a couple of months of travel with only light usage, then it appears that the laminate of the material used has seperated or perforated. Now there are thousands of very tiny holes all over teh mat. Have submerged it in a bath when trying to repair it!
I have met 2 other people with similar experiences. I have seen the down mat and teh fabric and constuction looks very similar. It is also expensive, so if i were you i wouldn´t risk wasting the money. Exped have never replied to any of my emails either!
Mine stays inflated now for a couple of hours just to let you get to sleep. then you wake up in the middle of the night as you find the floor a little cold ;o)
That´s my experience with exped so hope that helps your desicion!
cheers
mike
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