TENA® Underpad 23" x 24", Extra Absorbency, Blue, Moisture Proof Lining, Super Absorbent Microbeads, Disposable, Latex-Free Tena® Underpads for bed or chair protection are designed to cover mattresses in order to absorb leakages, reduce odors and maintain dryness. They consist of a polyethylene layer, combined with sealed edges, to ensure leakage protection. The highly absorbent material is evenly distributed throughout the core.