Ecobaby Vegan Innerspring Crib Mattress features organic cotton quilted to organic cotton mattress ticking, creating a long-lasting and comfortable place for your baby to get some shut eye. Baby will delight in sleeping on the natural 6″ thick mattress, free of chemical fumes you might encounter on conventional mattresses. EcoBaby crib mattresses are a 510 coil (260 actual coils – most crib mattresses are 180 coil) making for a firmer, longer-lasting mattress.