Hello, Our product is an 8-layer muslin fabric made of 100% natural cotton. It does not contain a special membrane or nylon style liquid proof layer. However, thanks to its 8-layer structure, it quickly absorbs and distributes the liquid, greatly preventing the baby's clothes from getting wet in cases of short-term drooling, food and milk spills. Thanks to its natural cotton, it breathes, does not sweat, and is extremely suitable for sensitive baby skin. It is both healthy and practical for daily use. � � We wish you pleasant shopping.