I was hoping someone could clear this up for me. I was looking on Speers website about his new underquilt. One is rated to 30*, and weighs 29 oz. I think. It is 900 fill down. Now, the KAQ Potomac weighs 28 or 29 oz., and is also rated at 30* but is synthetic. Am I missing something, or are Speers numbers wrong? Because I have had read a few people say the KAQ will go down to 30*. If this is correct, then why spend twice as much on something that will loose a lot of effectivenes when wet, and is more delicate? You tear a hole in a synthetic quilt, you can just sew it up. Tear a hole in a down quilt and it will look like a duck blew up.