The lightest and best priced Nook matress yet! Breathable design optimizes airflow throughout the mattress. Mattress core air channels provide maximum air circulation from top to bottom and side to side. Certi-Pur Foam Core with the Pebble wrap make for an all-in-one sleep system. Certified non-toxic core provides natural support. Eucalyptus surface fibers wick away moisture and regulate temperature. Removable and washable Pebble Wrap makes clean up simple. Mattress ships rolled and compressed in a 32" x 11" box.