We ordered these sheets thinking they were flannel sheets - they showed up when we searched for flannel sheets.  When we got them we discovered that they were microfiber and not flannel.  My wife and I discussed it and decided to give the sheets a try.  The sheets do have deep pockets (about 18 inches), but they are just short for our mattress which is about 19 inches.  We have gotten around that by using sheet clips to keep them down.  The sheets themselves are probably the most comfortable sheets we have slept on, even though they are not flannel, they have kept us warm and we have not had to start using two quilts yet, which we usually do in the winter. We absolutely love these sheets.