In addition to the material and make, it's also important to know the care instructions for flannel sheets.  Quality flannel sheets should be easy to care for and retain their softness and color after multiple washes.

 Thread count is another important factor to consider when choosing flannel sheets.  While the higher the thread count of regular cotton sheets, the better the quality, with flannel sheets, this is less important.  Instead, focus on the fabric weight and overall feel of your bed sheets to gauge their quality.