What is PUL Fabric? So what's polyurethane laminate (apart from a mouthful!)? Polyurethane laminate is often abbreviated to PUL fabric. PUL is a special kind of waterproof fabric as it has the unique properties of being waterproof AND breathable. So why is this important? It means you can make waterproof items of clothing and cloth nappies and your body heat has a better chance of escaping in to...