All insulating materials lose LOFT being compressed; goose down, lamilite, steel wool, road kill sheep. The insulating material's ability to regain that loft is the criteria at issue. Obviously we can't run around with extended sleeping bags like some emerging butterfly. All materials will experience a percentile loss in spite of all the fluffing and shaking we invest before crawling inside. I am a prejudiced fan of lamilite and Jerry's product. I can't afford a permanently compressed bag, but I've stuffed mine away and anecdotally found the insulation very close to maximum efficiency within an hour. For $25 you can't lose much. Buy the bag, compress it for a few weks and then crawl into the thing on a cold night. If your uncomfortably chilled you've only lost $25 and possibly saved your life. I'd rather have a Wiiggy than a inexpensive bag, a $25 bag over a space blanket and a space blanket over nothing <img src="/images/graemlins/wink.gif" alt="" />