I have had flannel top sheets, never bottom, but I did find out about t shirt sheets. I love them - they are warm, they hug the mattress and me, too. The top sheet is light (weight wise), but warm. I got a complete double size and pillow cases for $21.99 at Target For what it is worth!!!!!!! Flannel makes for a good top sheet or light blanket. Happy Thanksgiving to all of you. Edie