The Rumparooz One Size Cloth Diaper Cover is designed to grow with your baby, with 4 adjustable rise settings; newborn, small, medium and large. Weight range of cover starts at 6 pounds and will fit up to approximately 35+ pounds. Rumparooz One Size Cloth Diaper Covers are generously sized and designed to fit over most fitted or prefold diaper. Covers may be used multiple times before washing but should be placed into the laundry if it becomes soiled. Kanga Care uses a water resistant polyester TPU which is a solvent-free polyester fabric that has been laminated with a thermoplastic polyurethane using a heat bonding process, not chemicals. This process is low in toxicity and is better for the natural environment than traditional PUL.