Our organic felted wool puddle pads use our ecowool which is carded and certified organic during this processing by Oregon Tilth. It is then felted at a west coast felting mill. This felted pad naturally resists liquids to protect your crib mattress. No polyurethane or other synthetic backing is put on our wool. This felted wool pad is not as soft as our regular, un-felted Wool Moisture Pads. Easy to care for, machine wash delicate or hand wash-cool, then hang to dry.