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Fit: Mattresses that Match Your Body
How to Find a Mattress that Fits Your Size, Shape, and Sleep Position(s)

Last updated on June 22, 2022

The right mattress for you will provide your body with enough support to keep your spine in proper alignment while you sleep, and enough cushioning to relieve pressure under sensitive pressure points like the shoulders and hips. 

The Non-Negotiables: Mattress FIT

Many aspects of a mattress are based on personal preference and individual priorities. These include how much softness you prefer, whether you like to sink deeply into a bed, or rest mainly on top of it, whether you like a mattress that's bouncy, whether you need good edge support or motion isolation, etc.

But no matter whether you personally enjoy a fluffy mattress or a flat one, the right mattress for you MUST fit your body, providing back support and pressure relief. Without those, you're looking at possible back pain, joint discomfort, and lousy sleep quality.

Fit is also highly personal: A mattress that provides excellent pressure relief for a 225-lb. man might not provide enough cushioning for a 125-lb. woman.

Your body's curves also matter, especially for side sleepers. For someone with broad shoulders, for example, more body weight will rest on the points of their shoulders, while for someone that's less curvy, body weight will be spread over a larger area of the bed. All of these change what you need in terms of support and pressure relief.

Be sure to start with our Mattress Match Quiz, which takes all these factors into account.

Support for Proper Spinal Alignment

"Support" is a combination of a mattress compressing in some areas (like your hips and shoulders), while reaching up into other places (like your lumbar area or waist).

The ideal mattress for you supports your spine in neutral alignment. This means that the shape of your spine when you are lying down should be the same as when you're standing up straight. Your spine should maintain its natural “S” curve when you are on your belly or your back, and it should be straight when you’re on your side. There shouldn't be gaps between your body and the mattress; and if there are, that means you need more support in those areas. 

The term "support" refers to the aspects of the bed that push back in order to hold your spine in position while you sleep. Unlike comfort, which is largely a matter of personal preference, everyone requires support from their mattress. Improper or inadequate support can cause tension or back pain as your muscles compensate by working to keep your spine in alignment. Though mattress companies use words like "firm" or "extra firm" to explain the support provided by a bed, what they are really describing is the extent to which the inner core of the mattress (what you feel when you put one knee on the bed and then lean your weight into it) is "springy" or "stiff." The amount of support your body needs depends on your sleep position and your size. Different combinations of mattress types and materials can work for different bodies.

In our Expert Reviews, GoodBed evaluates mattresses for users in four size ranges because a mattress that's supportive for a 120-lb. side sleeper may not be as supportive for a 220-lb. side sleeper.

Below: Good spinal alignment. Note how our tester's spinal is in a straight line from his neck to the small of his back (the belt loop on his jeans)

Tomorrow Hybrid Side Sleeping

Pressure Relief

Imagine there is a pressure map underneath your body when you’re lying on a bed. It would look like a heat map—places where the pressure per square inch is highest would be orange and red (these are known as “pressure points”), and places where there’s less pressure would be blue and green. Pressure relief means that the mattress has enough "give" under weight-bearing points like the hips and shoulders, and that it rises to meet the parts of your body that don’t stick out as much, like the small of your back.

Inadequate pressure relief is a principal cause of tossing and turning in the night, since your body unconsciously adjusts when you feel pain or pressure in certain areas, or when part of your body loses circulation due to inadequate pressure relief. The more contact your body has with the bed, the more evenly your body’s weight will be distributed over the surface of the bed, and the less pressure you’ll experience throughout the night.

A mattress’ ability to provide pressure relief takes a little time to assess. As opposed to the general softness of the mattress, which is really about personal preference and can be assessed quickly, pressure relief has a more scientific, measurable quality. Practically speaking, it can take at least 10 minutes before you notice the signs that a mattress is not providing adequate pressure relief for you. You might notice, for example, that the mattress feels uncomfortable under your shoulder, or that your arm is slowly falling asleep.

Balancing the Two

Pressure relief can sometimes run in conflict to support. A mattress with a slight hammocking effect (where your hips and midsection sink deeply), for example, may be just what your body needs for maximum pressure relief, but it is unlikely to support your spine in proper alignment. The right mattress for you provides a balance of both.

Find the Right Bed

Not sure which type of bed to buy? Answer a few questions to see good matches for you with GoodBed's unbiased, personalized results.

Let's start… Select your preferred sleeping position:
This is awesome. Now I feel equipped to walk in somewhere and say with certainty, "This is exactly what I'm looking for."
— Sara in Phoenix, AZ

What size of bed are you looking for?

Not sure? Go to Mattress Size Guide