How to Adjust Lumbar Support | Find the Right Fit

Adjust lumbar support using a side switch, handle, knob, lever, or pneumatic bulb to move the lower-back support up, down, in, or out.

Lumbar support adjustment comes down to finding the mechanism your seat actually has. Most cars and office chairs tuck a control somewhere along the side of the seat or backrest, and the method varies by brand and model. Whether you’re dialing in a Polestar 2, a Kia Seltos, or a mesh office chair, the goal is the same: get the support to sit in the natural curve of your lower back. Here’s how to adjust lumbar support across the most common setups, plus the mistakes that wreck the adjustment.

Use the Seat Cushion Control in Polestar 2

Polestar 2 seats put lumbar adjustment right on the side seat-cushion control, so you won’t hunt for a hidden lever. Press the control up or down to move the lumbar support higher or lower along your spine. Press the front of the control to push the support outward for more firmness, and press the rear to let it ease back.

The controls respond in real time, which makes it easy to feel the curve settle into place. According to Polestar’s owner’s manual for the Polestar 2, the front position increases support while the rear decreases it. Adjust it while seated so your spine stays in its natural posture.

Adjust the Switch in Kia Vehicles to Avoid Motor Damage

Kia’s power lumbar support works through a four-way switch, usually on the side of the seat.

Adjust 4-Way Lumbar Support in Mercedes-Benz

Mercedes-Benz fits many of its seats with a 4-way lumbar support that moves both up-and-down and in-and-out. The adjustment is typically controlled by a switch on the side of the seat, near the seat-position controls, and it works the same way as the Polestar and Kia systems: press the switch to move the support vertically, then press in or out to set the firmness.

The exact button layout varies by model and year, so glance at the seat’s side panel before pressing. If the switch has multiple arrows on it, the up/down arrows usually control height while the front/back arrows control firmness.

Adjust Lumbar Support on Office Chairs

Office chairs use a wider range of mechanisms than cars, and the adjustment method depends entirely on the chair’s design. Some models slide the lumbar pad up and down along the backrest, some use a knob near the lower back that turns in and out for firmness, and others use a pneumatic bulb under the seat that you pump to increase pressure and a valve to release it. A few chairs skip the pad entirely and adjust lumbar support indirectly by raising or lowering the backrest so the lumbar curve lines up with your spine.

Before forcing anything, check which mechanism your chair actually has—a chair that only adjusts firmness won’t respond to height adjustments, and a mesh-back chair may have no lumbar adjustment at all. If you can’t find a knob, lever, or switch anywhere on the backrest or under the seat, assume the lumbar support is fixed and use a small cushion instead.

Common Lumbar Adjustment Mistakes to Avoid

The most frequent error is confusing lumbar height with seat-height or backrest-angle adjustments. Seat height raises your whole body, backrest angle changes the tilt of your spine, and only the lumbar control moves the lower-back pad itself. And assuming every chair works the same way will leave you pressing buttons that do nothing.

If you’re shopping for a new chair or want to upgrade your current one, tested picks for the best adjustable lumbar support cover options that give you both height and firmness control. When you do adjust, always do it while seated so the support lands in your spine’s natural curve.