New and improved, Simmons® Beautyrest® mattresses now reduce even more motion so you get a better night's sleep even when your partner tosses and turns. The 4-star World Class® Chelsea® Park line provides one of Beautyrest's highest levels of comfort, support and motion reduction. This line is a tremendous value as an investment in a great night's sleep for years to come. The extra, extra firm comfort level is explained below.To learn more and to find the right mattress for you, please see our mattress buying guide. Convenient In-Home Delivery In-home delivery, setup, and removal of your old mattress.