The Purple mattress is made of a unique material called the Purple Grid, which is a hyper-elastic polymer that is stretchy, gel-like, and instantly adapts and rebounds to the bodys movements. The Purple Grid is made up of 90% mineral oil-based, food-contact grade materials with no known toxins. The mattress also contains high-quality polyurethane foam that is free of harmful toxins or chemicals and is certified by CertiPUR-US, a non-profit organization dedicated to safe and tested foam. The Purple mattress is technically a hybrid mattress because it contains two different types of material, foam, and hyper-elastic polymer. The mattress is about 10 inches thick and stacked three layers high, with the Purple Grid as the top comfort layer and responsive coils as the bottom layer. The Purple mattress is more durable than other foam mattresses on the market because of its major secret ingredient, the hyper-elastic polymer, which is able to stretch up to 10 times its size and is very flexible.