Nope. Sap was added ~1980-1985 http://disposablediaper.net/general-information/disposable-diaper-history/bambinod said:isn't SAP somewhat of a recent development with diapers? Back in the 90's I'd imagine they were mostly soft thick pulp and didin't swell much when wet? I'd go with the XP Medical Absorbency Plus, level 4 for thickest. They're very soft, inside and out.