I've always made my quilts with two layers of insulation right on top of each other. However, I've noticed that in most commercially available synthetic bags, they use what they refer to (generally) as a shingled construction, or some other patented variation. The claims I've read on sights say that it creates more air pockets, greater compressibility and greater loft while eliminating cold spots.
Does anyone know how or why shingle construction is really done? Is it truly better than simple layer on layer construction? Or is it a more efficient or easier method of construction for manufacturers?
