The supervent foam mattress is uniquely designed for newborn babies in particular those who sleep in the feet to foot position this mattress is made of cmhr 25 density foam for a pefect nights sleepit is visibly ventilated from top to bottom which allows an even air circulation all over whatever position the baby is laid in the cotthere is a non toxic pvc sleeve which is adjustable anywhere over the mattress core or even removed entirely if desiredover this there is a tricot mesh cove