Tena, f.k.a. Harmonie Ultra Underpad conains superabsorbent polymer found in only the most absorbent bed pads available. Tena Ultra has a Polyethylene Backsheet, and a clothlike, soft topsheet which contacts the consumer. Tena chux will not slide off the bed or clump up like cheaper underpads. These chux pads are some of our biggest sellers and are sale priced to save!