swatchset. PUL Fabric is waterproof, so it is ideal for the outside of cloth diapers and diaper covers. Our PUL fabric also is breathable, so baby stays cool and comfy. All of the PUL fabric at Diaper Sewing Supplies is the Eco-PUL™ brand - a high-quality, made in USA PUL fabric. Read on to learn why PUL fabric by Eco-PUL™ is a smart choice for the environment and your baby.