A lumbar support cushion can make a chair feel much more comfortable, but only when it is positioned in the right place. Put it too high and it can press into the middle of the back. Put it too low and it may simply sit against the pelvis without filling the part of the chair that feels unsupported.
The aim is not to force an exaggerated posture. The cushion should fill the natural space behind your lower back so the backrest feels supportive and easy to use.
Start by sitting all the way back
Before placing the cushion, sit with your hips towards the back of the chair. If you sit near the front edge, it becomes difficult to judge where the support should go because your body is no longer using the backrest normally.
Once you are sitting back, notice where the chair loses contact with your lower back. On some chairs the gap is obvious. On others, the backrest makes contact but still feels too flat or unsupportive.
Place the cushion in the lower back area
A lumbar cushion should generally sit above the top of the pelvis and below the middle of the back. You are looking for the area where the lower spine naturally curves inward.
Do not position it according to the centre of the chair. Position it according to your body. Taller and shorter users may need the same cushion at completely different heights on the same chair.
Adjust the height in small steps
If the cushion feels as though it is pushing into the middle of your back, move it down slightly. If you still feel a large unsupported gap lower down, move it up a little.
Small changes can make a large difference. Move the cushion a few centimetres at a time and sit normally for several minutes before deciding whether the new position is better.
Make sure the cushion is not too thick for the chair
A lumbar cushion changes both support and seat depth. A thick cushion moves your torso forward, which means less of the chair seat remains underneath your thighs.
This can be useful in a very deep chair, but in a shallow chair it may leave you feeling perched on the front edge. If you cannot sit comfortably against the cushion while keeping your thighs supported, the cushion may be too thick for that particular seat.
The Ergonomic Seating Support Cushion uses a contoured design intended for office chairs, car seats and other everyday seating where additional lower back support is useful.
Check your feet and knees after adding support
Changing the backrest setup can subtly change the way you sit. After positioning the cushion, check that your feet are still supported and that the front edge of the chair is not pressing uncomfortably behind the knees.
If you have moved further forward in the seat, you may need to make a small chair height adjustment or use a footrest.
Using a lumbar cushion in an office chair
For desk work, the cushion should allow you to sit against the backrest while still reaching the keyboard and mouse comfortably. If adding the cushion makes you lean forward towards the desk, bring the chair closer or adjust the workstation rather than abandoning the backrest.
Also check the chair's built in lumbar support. If it already has a strong adjustable curve, adding another thick cushion may be unnecessary. The goal is enough support, not the maximum possible amount.
Using a lumbar cushion in the car
Car seats vary significantly. Some have pronounced built in lumbar support while others feel relatively flat. Position the cushion so it fills the lower back without interfering with your ability to sit securely against the seat.
After adding the cushion, recheck your seat distance from the pedals, steering wheel position and mirrors because your torso may now sit slightly further forward.
Using a lumbar cushion on a sofa or dining chair
Deep sofas often encourage the body to slide forward because the backrest is far away. A supportive cushion can reduce the effective depth and make it easier to sit back.
On dining chairs, space is usually more limited, so a thinner cushion may feel more appropriate. The same positioning principle applies: support the lower back rather than placing the cushion high behind the ribs.
Signs you should reposition the cushion
- It presses into the middle of your back instead of the lower area.
- You feel pushed too far towards the front edge of the seat.
- You keep sliding away from it.
- Your shoulders or upper back cannot comfortably reach the backrest.
- The chair becomes harder to use rather than easier.
Comfort is the final test
There is no universal centimetre measurement that works for everyone. A good position should feel supportive without constantly drawing your attention to the cushion itself.
Use the natural curve of your lower back as your guide, then adjust the height and chair setup until the support feels integrated with the seat rather than like a separate object pushing against you.
You can explore more options for desk, car and home seating in our Lower Back & Posture Support collection.
Frequently asked questions
Should a lumbar support cushion sit at the waist?
It usually sits around the lower back area near the natural inward curve, which may overlap with the waist area depending on your proportions and the chair.
Can lumbar support be too thick?
Yes. If the cushion pushes you too far forward or leaves too little seat depth, a thinner option may suit the chair better.
Should I use lumbar support if my chair already has it?
Not necessarily. First adjust the chair's built in support. Add a separate cushion only if the existing setup still feels too flat or does not suit your body.
Can I use the same cushion in my car and office chair?
Often yes, but each seat has a different shape and depth. You may need to adjust the cushion height and your seat settings each time you move it.
