I vote for Climashield - I have 2 quilts made with it, a 40F from the 2.5 oz/yd (thinner) (15 oz complete) and a sub 30F from the 5 oz/yd grade (24 oz complete, if I remember right). The continuous filiament makes construction easy, but like others, I put a few quilting loops in. They make packing easier and I feel more secure with them.