Baffle Box Design
Many manufacturers would tell you a true baffle box is the most difficult and expensive design for a down comforter shell and it is. The baffles, which are the vertical interior walls in the middle of the comforter (see 'baffle box' arrow) are usually 1" to 2" inches tall. The outer shell, the top, and bottom attach to these vertical walls creating a three (3) dimensional square or baffle box. Hence the name baffle box design.