It has a "stiffer" side for babies (babies should sleep in a stiff surface) and it as a "softer" side for toddlers. The sides are easily identifiable by a tag. 
It comes with a soft removable, washable and water resistant cover. 
The mattress came packed and rolled in a air suctioned bag - it's cool to see it expand when you open the bag. 
Mattress has 6 years of warranty.