Bacati Bumper Pad (2 pcs 52 x 10", 2 pcs 27. 5x10"), Soft 100 percent cotton percale with lofty polyester fill and machine washable. Cotton fabrics are excellent with newborn babies and does not give skin rashes like other polycotton or polyester fabrics give. Gets softer with every wash. Please make sure you read JPMA Nap to Night time brochure insert with the bedding.