Prewashed, 605 threads per square inch. Duvet covers have a button closure. Top sheets are hemmed on four sides with mitered corners and generous turn back. Fitted sheets have a pocket with an extra 3" to tuck under, and elastic all around. Pillow cases have a button closure. Pillow shams are flanged, with a back envelope button closure. Bed skirts are paneled & adjustable up to a 19" drop.