This reusable mattress pad will protect your mattress from damaging moisture. The sleeping surface is made from an 20%/80% polyester/cotton blend called IBEX, so you know this pad is soft and comfortable. This top sleeping surface is quilted to an 8 ounce poly-soaker that locks in the moisture. Underneath this layer is the waterproof backing. This backing is made of knitted, vinyl barrier fabric that prevents moisture from leaking through to the mattress. Also, this bed pad features 2 tuck-in wings to keep it from sliding during the night – which is great for an active sleeper! The wings are 19” in length, and both will tuck in on twin or hospital sized beds. For larger beds, at least one wing will tuck in. Amazingly, this mattress pad can hold up to 60 ounces of liquid! Dimensions: 36” x 32”. Machine washable and dryable, this bed pad has double bound edges that will withstand many years of washings.