What inside nappies that makes liquid absorb?

Inside nappies, the liquid is absorbed primarily by a superabsorbent polymer (SAP), which can absorb and retain large quantities of liquid relative to its weight. This polymer forms a gel-like substance when it comes into contact with moisture, effectively trapping the liquid and preventing leaks. Additionally, the nappy's inner layers often include fluff pulp, which helps distribute the liquid evenly and increases overall absorbency. Together, these materials ensure that the nappy remains dry against the skin and keeps the baby comfortable.