A good set of flannel sheets should be so warm and inviting that it’s hard to leave them on a cold morning—if you don’t want to stay in bed all day, they’re not doing their job.

You can double up on socks and put on a sweatshirt and sweatpants, or you can make your bed a warmer environment as a whole by swapping your regular bed sheets for flannel ones. And right now ...

They also have 9,300 perfect ratings and 1,600 five-star reviews. My favorite time of year is flannel sheet season, when it’s finally cold enough to make my bed extra cozy. Over the years ...