I have been looking for years to find sheets that fit my extra thick (18"+) king size mattress. After purchasing at least 7 sets of sheets over the last 3 years with little to no success with regard to thickness fitting, I struck pure gold with this more than adequate sheet set. Finally!! The sheets and pillowcases are smooth,silky, and shiny.......so if this describes the kind of sheets you desire, look no further. If you personally like a softer, almost flannel feel, these are not the sheets for you. The most important reason I like these sheets is the fact they are extra large and are more than large enough to fit my extra thick plush mattress.