I looked high and low for an inexpensive organic cotton mattress cover and found it at Overstock! Others were way more expensive. Although my baby is not here yet, I have washed it and it is ready for use. It washed well and is very soft. My mattress is very very firm and I think this may help a little. It is not too soft to where I would be worried. So no problems so far with...will repost if something changes.