I'm looking to make a quilt rated around 45 degrees. Currently looking at either 2.5 oz/sqyd Climashield Apex or down for insulation. I've been leaning towards the synthetic but was wondering if I'd see much improvement weight-wise if I went with down? And how much down would I need to use?
My other concern is the increased difficulty in creating a sewn-through down quilt vs. climashield which doesn't require any quilting.

