I think he is referring to fitting a 15-year-old, so the design and material may be different than the disposables designed for infants. It seems to me that a cloth-like material would be more comfortable and breathable, but manufacturers would certainly not use anything that leaked. As I former cloth-diaperer (of infants), I think you'd be surprised at the quality of materials they now have. Polyurethane, for example, feels like cloth and is breathable, but is just as waterproof as plastic. Disposable baby diapers also feel like cloth now, but they don't leak (not through the material anyway).