Delivery. 10Year Warranty. Sealy Baby Ultra Rest Crib and Toddler Mattress. Free Shipping. Buy Sealy Baby Ultra Rest Crib and Toddler Mattress, Innerspring at Sealy Sealy Response Kenney Firm Queen Logan mattress Downey Sealy Performance™ Collection Durable allover support, plus exclusive Posturepedic Technology™ for reinforced support where you need it most, fo... Size Queen Mattresses Kmart Kmart carries mattresses in a wide variety of sizes, ranging from twin to California King. Sleep soundly on traditional top or plush pillowtop designs.