The absorbent diapers from Pet Interest consist of five layers. The first outer layer is made of high-strength material that does not tear from the dog's nails while simultaneously trapping moisture in the 2nd and 3rd layers, which are made of active polymers*. Active polymers have the property of absorbing three times their volume (unlike cotton which absorbs only once) while also distributing the moisture across the entire surface of the diaper. Finally, the last outer layer is laminated to ensure waterproofing.