Naturepedic Organic Crib mattress - Classic 2 - stage innerspring. https://www.naturepedic.ca/baby/mattresses/organic-cotton-classic-seamless-baby-crib-mattress Slept on for 4 years. Daughter was not a bed jumper and moved into a big girl bed when she was about 30 lbs. In great condition. Wipe clean surface = stanitizable :) Text preferred.