With a patented asymmetrical surface, the Bloom Nook Pebble Lite Mattress facilitates airflow over and through the pebble lite mattress, allowing more oxygen flow in the Alma Papa. The silky eucalyptus wicks moisture away from baby's skin ensuring a continuous and comfortable night’s sleep, while a patented, non-toxic nano-layer on the pebble surface prevents liquid, dirt and oil from seeping into the mattress.