So far, these have been the best flannel sheets I've ever owned!  They aren't quite "heavy" weight, but definitely heavier than any other flannel sheet I've owned.  They are delightfully soft yet sturdy to sleep on.  No pilling so far, so I'm planning to buy more!  The deep earthy beige color is unique and also delightful.  I have a deep mattress, and they fit perfectly.  I recommend them highly.