Your second consideration should be support and comfort for your weight and build. Good and proper support is determined by the coil springs inside the mattress and should be conducive to proper spine alignment. You must be able to try out the beds by lying on them for at least 10 minutes getting a feel of how firm the mattress is. When you lying sideways your spine should be straight and when you lie on your back your spine should maintain its natural curve. Do as Goldilocks did and choose a mattress that is not too hard not too soft but just right and according to orthopedic experts that should mean the firmest and most supportive mattress you feel comfortable in. Try your usual sleeping positions as well as a few tosses and turns. If it is going to be a bed for two you should go for something larger and one that minimizes partner disturbance and should enable you to lie side-by-side with your arms behind your head and elbows out but not touching.
One very important thing to note however is that while it is possible to make purchases online which also has the advantage of letting you compare prices as well as being able to get free 30 to 60 day trials it is still recommended that you make the time and effort to physically shop for beds as it is the best and most effective way to choose the best bed. Never shop when you are tired as any mattress you lie on will feel good. Do not be afraid to spend as much as you can afford as it is the most important piece of furniture you will ever own. With many styles and designs to choose from that will not only give you value for your money but also reflect your personal style.
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