The inside of the Peaceful Lullabies has cotton and wool blended fibers. The wool is naturally moisture deterring, which helps to keep your child’s body temperature regulated. This is one of the only Safety 1st mattresses that has some type of heat regulating feature to it, which I love.
As with all of the other Safety 1st mattresses I have tested, this one came in that plain brown box and was covered in plastic on the inside. It came with an insert that told me all of the features it has. This information is very valuable in my opinion because you have all of the facts right there in front of you rather than having to get on the internet to find it.