Thin, durable, soft, and flexible, this innovative fabric is 100% waterproof and windproof, making it ideal for eco-friendly cloth diapers, baby bibs, raincoats, umbrellas, shower curtains and lunch bags. This polyurethane knit is comprised of a layer of polyurethane laminated onto cotton fabric, allowing for soft fabric against the skin while providing waterproof protection. Line totes and bags with PUL and simply wipe clean with a damp cloth. Machine washable and safe for the dryer. 56" wide PUL polyurethane knit, from Fabri-Quilt. Polyurethane is a polymer - a class of chemicals derived from petroleum.