Buckwheat pillows look simple until you compare them side by side. Most are built around the same basic idea: a fabric case, a zipper, and buckwheat hulls. But once you handle them, adjust them, and actually lie on them, the differences show up quickly. Some feel too loose. Some feel too hard in the wrong way. Some have thin covers that do not feel right for such a heavy fill. Some are easy to adjust. Others make you worry about spilling hulls every time you open the zipper.