The removable surface layer of the Nook Pebble Lite 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 Lite Wrap and swap colors. For use ONLY with the Pebble Lite Mattress.Materials: Eucalyptus, Organic Cotton, Zinc, Polyester, Easy-Close Nylon Zipper Care Instructions: Machine wash cold with mild detergent. Tumble dry. Do not use fabric softener or chlorine bleach. We recommend the use of a top sheet to prolong the life of your PebbleCollection: Pebble Lite
