<div class="productDescriptionWrapper"> <p>The removable surface layer of the Nook Pebble Pure mattress employs a patented asymmetrical design and nano-level technology to maximize breathability. Air flows in valleys between pebbles creating an oxygen-rich crib environment while surface fibers with nano-technology prevent liquids from seeping into the mattress for easy-wipe clean up. When it's time for a nursery makeover, just unzip the Pebble Pure Wrap and swap colors.<br /> <br />For use ONLY with the Pebble Pure Mattress. <br /><br /><strong>Materials</strong><br />Eucalyptus, Organic Cotton, Zinc, Polyester, Easy-Close Nylon Zipper <br /><br />28&quot; x 53&quot; x 4&quot;</p> <div class="emptyClear"></div> </div>