1st Step's Supa - Dry Mattress Protector Is An Ultra-Thin, Silent Non-Quilted Protector That Creates An Invisible Layer Protection For Your Mattress. The Supa - Dry Mattress Protector Has Highly Absorbent Surface Of Fabric, Which Absorbs The Water/Liquid Into, However The Membrane Beneath Does Not Allow The Water To Pass Through It, As It Has A 5-Guard Water Proof Membrane Laminated Beneath It. It Protects Against Dust Mites, Bacteria, Allergens And Liquid Spills. The Supa - Dry Mattress Protector Is Suitable With Any Mattress Including Memory Foam Latex And Inner Spring Mattress.