Shipping rates vary depending on the destination. With a one-sided mattress, you re in trouble. The fact is, turning a mattress extends its life because it gives the upholstery foam and filling time to relax. No matter what any person or any brochure tells you, the foam and filling in every mattress will eventually settle and compress to conform to your body weight. It s a given.
Testing proves it.
What s more, if your mattress every gets wet, the inner workings compress even more, making the problem of a one-sided mattress even worse. So to maximize the life, you should rotate the mattress, much like rotating your tires for longer wear. And you ll need a mattress with two sides to do it. Foundations do not have springs. Foundations are actually better for a King Size mattress.