Jensen's zone system provides the right support for the whole body when you rest and sleep. Lumbar support combined with a soft shoulder zone offers an optimal sleeping experience. The principle of the zone system is as self-evident as it is natural. Most people are broader over the hips and shoulders, while the waist is the heaviest and often narrower. Since the mattress's task is to support the body, the zoned mattress provides a more even and comfortable support, where the shoulders and hips sink slightly deeper into the mattress and are met by firmer support. Whether you lie on your back or side, the result is the same.