These sheet are lovely.  I was disappointed at first because they were sateen, debated on returning them but after washing them, they turned out nice.  The flat sheet is not as long or wide as I'd like and after washing/drying the edges of the flat sheet rolled but thickness of the sheets was my priority. I'm hoping that a larger thread count would mean better made and longer lasting sheets, but time will tell.  In the corners of the fitted sheet, there is an encased elastic section midway (between the edge and top corner) that might NOT work well with a extra thick mattress &/or topper.  My mattress is about 10", so this feature should keep the fitted sheet snug.  During the summer months these may be uncomfortable to use, but then I'll switch to a lighter flat sheet.