I made an Underquilt from an Costco Down throw and it's worked out great without ripping any of the seams. Yesterday, I was in Costco and found the Down Throws on display and wondered if there was any advantage to ripping one direction of the seams as most people seem to think. I bought a throw and ripped the seams, sewed on the suspension the same way I did the non-ripped UQ. I plan to toss it into the dryer for a few minutes with no heat and a couple of tennis balls to fluff it up and then hang in both to see if I can tell the difference.
If someone has a more objective way to measure the difference in insulating value between them that doesn't involve purchasing expensive equipment, I'm all ears.
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