Available Sizes - It is available in six sizes, from an 18 to a 62 inch waist. Prefold, flat Adult cloth nappies contour cloth diapers all require a waterproof cover to contain wetness. It is white in color versus the color-coded systems used by some manufacturers. This talks about how well the product conforms to a person's body. We always try to be as neutral as possible. Adult cloth nappies will vary in absorption from light to heavy.