3-Ply Tissue / Poly Backing Mckesson Medical Underpads Feature A Heavy 3-Ply Core And Absorbs Large Amounts Of Moisture Disposable Underpads Guarantee Minimal Cleanup. Keeps Bedding Clean And Dry With Its Waterproof Poly Underside; Keeps Wetness From Seeping Through Made From Tissue Paper, These Medical Underpads Are Soft, Comfortable And Limit Skin Irritation; Latex-Free Materials Make It Suitable For Those With Allergies And Sensitivities Non-Absorbent Poly Underside Is Blue To Show It Faces Down On The Surface While Providing A Soft, Gentle Touch