Sani-Pant One-Piece Waterproof Cover-Up by Salk is a popular 100 percent waterproof diaper cover designed to prevent leaks onto furniture and clothing. An updated version of traditional plastic pants or rubber pants, these laminated polyester underwear are designed to provide added security over disposable diapers, pads or liners. The soft cotton elastic bindings on waist and legs won t chafe or irritate the skin.