The single-sided mattress is padded on one side. The other side is designed to rest upon the foundation with a durable nonskid surface. Customers can rotate periodically to improve their durability but do not flip the mattress. Monarch Rest single-sided mattresses are built from the support core upward, adding comfort layers as we build upwards toward the topmost quilted cover. The innerspring core or super high-density polyurethane core and various combinations of foam layers above the core create a customized firm or plush feel. This customization accounts for the growing popularity of single-sided mattress.