First of all you need to know why you want a new bed to begin with. Is it for a health issue? Are you looking to replace the entire bed or just the mattress? Whatever your reasons are remember that it is best to consider your purchase as a whole and not as individual components since the mattress and the base work together. When choosing a bed due to issues with back pain it is all the most important that you prioritize support as the bed you buy must be able to adjust to your body shape and support your correct posture. Depending on the severity of your back problem you may need to use those memory foam mattresses that are so popular nowadays because they actually conform to your body shape and give you the proper support you need.
OK here is one case where size really matters. Beds are usually bought based on the general rule of thumb that it must be the biggest bed you can fit in your room. Remember that size should not only be based on width and height but also the length which should ideally be 10-15 centimeters longer than the tallest sleeper. Those who are over 6 feet in height may have to go for customized beds but if you search diligently online you should be able to find bed manufacturers who make beds up to 7 square feet or cater to other special size requirements.
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