I have probably 500 nights on my oldest Wiggy's bag, and I have it unzipped and use it on my bed as a comforter, too. It's been washed and dried many times and hasn't lost any loft. The company has learned that some detergents can zap the loft but they will replace or repair any bag, no matter how old, forever. I suppose I'm a fanboy but I can't see how you beat a forever warranty in a bag as good as a Wiggy's bag.