Made my mattress soft and cozy. I got a new mattress that didn’t have much to it so I added this on top and now it the perfect comfort and height. I am happy with it. Flattened out quickly no weird smells. Arrived fast. Update per Wayfair request: It does not stay in place slides off my bed I am having to readjust it every day and the bed is still hard had to add an additional memory foam for comfort.