What is the Purple® Mattress made of? What is the material? The Purple Grid is made up of 90% mineral oil. Learn more about the patented material HERE. Related articles What is Purple made out of? What fire retardant is used on the Purple® Mattress? What kind of foam do you use in the Purple® Mattress? What do you mean when you say Purple is ""non-toxic""? What's the life expectancy of the Purple Mattress?