Flannel is generally made with either a twill or percale weave. The fabric is then napped to hide the weave. Napping is a finishing technique that gives flannel that signature fluffy, fuzzy feel. Flannel can be napped on just one side, or it can be double-napped, meaning both sides of the fabric are napped, for extra softness. Flannel is also often sheared after napping for a smoother texture.

Ply refers to the number of fibers used to create one thread. One-ply sheets have one fiber, while two-ply sheets have two fibers wrapped together to create a single thread. 

And finally, brushed cotton is for those looking for something in the middle in terms of cooling/heat-retaining qualities. To turn cotton into brushed cotton, the fabric undergoes a couple of extra treatments that result in the softest flannel-like bedlinen. While both percale and sateen sheets may take a few washes to become more supple and soft, a new set of brushed cotton bedding feels like you’ve slept in it forever. It is a great year-round option because it won’t warm or cool you down excessively.

4. Cotton Percale