What is the Essential mattresses made of? OTTY 26 July 2019 13:20 Follow We’ll let this diagram of the layers do all the talking for us: Related articles What is the Hybrid mattress made of? How long do I have to leave the mattress to expand until sleeping on it? How heavy are your Hybrid mattresses and what sizes do you offer? How deep is the mattress? Will it fit my sheets? Can I use an electric blanket with my OTTY Essential? Comments 0 comments Please sign in to leave a comment.