Our cutting staff accidentally picked up the wrong roll of fabric when processing these pillowcases - instead of pulling out our 320 Thread Count Sateen fabric, they picked up a roll of white cotton twill fabric. We didn't realize the mistake until the cutting was done. So we now have a small supply of pillowcases made out of a soft and extremely durable white 100% cotton twill fabric - it's an expensive, heavier weight fabric (a little lighter in weight than denim) but is still very soft and not at all stiff. These heavier twill pillowcases would be great as just a white pillowcase, or for a kids craft project - fabric markers or paint, iron ons, tie dye, embroidery, or for a daycare/preschool. Designed to fit our 12 x 16 pillow inserts.