A Harga Central Spring Bed (or even divan in certain countries) is a type of mattress foundation typically comprising a sturdy wooden frame covered in cloth and comprising springs. Usually the box-spring is set on top of a metal or wooden bedframe that sits on the ground and acts as a brace, but in the UK where the divan is much more often fitted with little casters. The box-spring is normally the same size as the much softer mattress that is placed on it. Working collectively, the box-spring and mattress (with optional mattress frame) constitute a bed. It's common to locate a box-spring and mattress being used together without the support of a framework underneath, the box spring has been mounted directly on casters standing on the floor.

The purpose of the box-spring is threefold:

1. To raise the mattress's height, making it easier to get in and out of bed;

2. To absorb shock and reduce wear into the mattress; and

3. To make a flat and firm structure for the mattress to lie on.

The initial rectangular spring-cushioned wire frames to support mattresses did not possess wood rims or fabric covers. These were called bedsprings. A growing number of box-springs are being created out of wood, then covered in fabrics. Wood creates a much better support system for the newer memory foam and latex mattresses. The newest design in box-springs is that the folding box spring made from metal or wood, then coated in fabric which may fold in half and can be sent by transport and courier companies.

With the increasing height of mattresses, manufacturers today produce box springs in various heights so the mattress and box spring pair maintain a standard elevation. Standard "high profile" box springs are 9 inches (23 cm) in height, whereas "low profile" box springs are between 5 and 5.5 inches (13 and 14 cm). Changing the depth of the box spring and mattress require revisions into the mattress and box spring coil stiffness. This is often why box spring and mattress are matched and sold in pairs.

Box-spring beds are especially popular in North America and Western Europe. Alternately, in Japan, futon mattresses are often either put on a bedframe or on the ground, without using springs.

In Europe, wooden frames with a middle section composed of springs held in place by cable (to be placed into the wooden bedframe for a unit) used to be the standard for the majority of the 20th century.

The springs have largely been replaced by pre-bent wooden slats (usually glulam made from beech or birch) that are joined to the outer wooden framework by some type of flexible rubber bolt, shoe or socket. This lath floor provides suspension, enables the mattress to ventilate, and can be designed to be vertically adjustable so as to elevate the legs or the torso.

A more simple approach is to become part of directly laths with a textile strap so they may be rolled up for transport and also placed right into the bedframe.

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