COTTON DUST SHEET 4 X 4 REGM35 Regin REGM35 Cotton Dust sheet - 4X4. The Regin REGM35 Calico Cotton Dust Sheet is made from 100% cotton and is ideal for protecting furniture and floors from dust and other small debris. The dust sheet is 4' x 4' [122cm x 122cm], machine washable and reusable.