Showing Coil Spring Memory Foam and matching Sealy
The Bonnell Spring Unit is the most common spring unit and consists of hour glass shaped springs, linked top and bottom by a spiral wire which runs across the finished unit. The unit will then usually have a retaining wire that is clipped around the perimeter of the mattress, top and bottom, called a rod edge. This provides the edge of the mattress with extra support. Economy beds may have a plastic as opposed to a metal rod edge and some have none at all. The thickness of the wire used in the construction of the springs is known as the wire gauge. The higher the gauge, the thinner the wire will be and terefore the softer the mattress will feel. Most Bonnell units use a 13 gauge wire. A few orthopedic models will use a 12 or 12.5 gauge as a thicker wire will make a firmer spring. A standard double mattress will usually contain approximately 288 Bonnell springs. The quality of the mattress will then be dependent on the gauge and the amount of filling used. As well as the quality of the cover, some divans have a double layer of springs which should give a much bouncier feel and be more durable over time. You can also have a spring system called Sleepzone or Miracoil (the famous Silentnight spring system) this is similar to the above however the springs run top to toe and normal have around 600 springs per 5' model. Memory Foam This was originally developed by Nasa for the seats used by astronauts during take off. Since then it has been widely used in hospitals and nursing homes. During recent years it's popularity has really "exploded". Visco Elastic Foam is a man made heat sensitve material. The body temperature of the sleeper heats up the foam which then moulds itself around the sleeper's body contours. This offers the sleeper fantastic support, the correct sleeping alignment and disperses the sleeper''s weight over a larger area reducing pressure points on the shoulders, back and hips. Visco Elastic Foam has been medically proven to help with numerous ailments including back and joint pain, arthritis, circulation problems and sciatica to name but a few. The quality and price will depend on how much foam has been used and also the density of the foam. The higher the density, the more responsive the foam is. Many foam mattresses are anti-allergenic and provide a very different feel than a tradional fibre filled mattress. You can have memory foam on top of reflex foam, open coil springs, continious coil springs and pocket springs.