Purchased to extend the life of pillow top mattress since "full flip" isn't possible. There was not a heavy chemical smell when received as with other foam toppers (it was well packed, but the plastic enclosed had small openings that allowed air circulation. Still sprayed with Fabreeze and allowed to air put before putting on bed). The mattress flattened out completely after about an hour. Topper cover is soft and plush (reminds of a down filled quilt). If a firm topper is preferred, this may not work because it has a very plush feel. The memory foam contours well and does not hold much body heat (but will help keep you warm on colder evenings.)