Although flannel can be made from various materials, including wool or synthetic fibers, it is most commonly associated with cotton ... sheets weigh only five ounces per yard, making them thick ...

While thicker than percale or sateen sheets, they're not overly thick — instead ... Flannel is a woven fabric commonly made from cotton or sometimes wool. It has a thicker weave than percale ...

We've tested and reviewed products since 1936. Read CR's review of the Nordstrom Organic Cotton Sateen (400 TC) sheet to find out if it's worth it.