What Is Adjustable Lumbar Support? | Built-In Back Relief

Adjustable lumbar support is a chair feature that lets you move lower-back padding up or down, and in some designs increase or decrease pressure, to match your spine’s natural curve.

For the full breakdown, see our best Adjustable Bed With Lumbar Support guide.

Most office chairs leave a gap between your lower back and the backrest, which forces your spine into a flattened, slouched position. Adjustable lumbar support closes that gap. It moves the support to sit at the right height—usually just above your belt line—and can add enough depth to hold the natural curve of your lower spine without pushing you forward into an exaggerated arch.

The result is a chair that actually fits your body, rather than a chair that forces your body to fit it. Below is what the feature does, how it differs from other back-support systems, and how to tell if you’re using it correctly.

How Adjustable Lumbar Support Works on a Chair

Adjustable lumbar support generally comes in two forms: a pad that slides along a track, or a cushion that increases and decreases in depth. Both do the same job—supporting the inward curve of your lower back—but they feel different in practice.

On Herman Miller’s Aeron Chair, the adjustable lumbar support uses a strap on the back of the chair. You raise or lower the pad within the adjustment track until it comfortably supports the spine’s natural curve. You sit, adjust, and test until it feels right.

Tempur-Pedic’s premium office chair works differently. Its TEMPUR-Lumbar Support™ is an adjustable cushion designed for mid- and lower-back support. The chair also includes a one-touch pneumatic seat height adjustment, a synchro mechanism with adjustable tilt tension, and an easy-set tilt lock. The lumbar pad sits separately from the seat and tilt controls, so you tune each independently.

Adjustable Lumbar Support vs. Other Back Support

Adjustable lumbar support is not the same as broader back-support systems, and confusing them is a common mistake. On the Aeron, for example, Herman Miller distinguishes adjustable lumbar support from Adjustable PostureFit SL. PostureFit SL uses a knob on the back of the chair and supports the natural alignment of the spine and lower-back comfort. The lumbar pad targets one spot; PostureFit SL supports more of the spine’s structure.

General padded backrests are another category entirely. A soft, fixed pad that runs the length of the back is not adjustable lumbar support—it cannot move up or down to match your spine. A separate lumbar cushion can be adjustable if it moves, but many are simply fixed pillows.

Where Should Lumbar Support Sit?

Lumbar support should sit roughly one-third of the way up the backrest, or just above the belt line. That position lines up with the inward curve of your lower spine, which is the area that needs support when you sit for long stretches.

Effective lumbar support fills the gap between your lower back and the backrest, sits at belt height, and provides enough depth to support the curve without pushing you forward. Support that sits too high, too low, too shallow, or too forceful will fail to do its job and can make sitting less comfortable than no support at all.

For shared workstations, depth-adjustable or pneumatic lumbar support beats fixed support. Different users can tune the pressure more quickly, so each person can dial in their own fit without tools or disassembly.

How To Adjust It Correctly

Adjustment steps depend on the mechanism, but the principle is the same: sit, adjust, and test until the support meets your spine’s curve without forcing it.

For the Herman Miller Aeron (strap-based): Sit in the chair and use the adjustable strap on the back to move the lumbar pad up or down. Stop when the pad comfortably supports the natural curve of your spine. You should feel contact, not pressure.

For PostureFit SL (knob-based): Sit with your back against the seatback and turn the knob forward until the support feels right. To disengage it, turn the knob backward while seated.

For Tempur-Pedic’s chair: Use the height lever to set seat height, use the tilt function to set back angle, and then adjust the lumbar pad separately for mid- and lower-back support. The chair supports seat heights from 19 in. to 23 in. and a max capacity of 275 lbs.

One caution: “ergonomic” is not a certification. When evaluating a chair, check measurable standards such as BS EN 1335, ANSI/BIFMA X5.1, and BS 5852 instead of relying on marketing language. The real question is whether the chair’s adjustments fit your body dimensions—not whether the label says “ergonomic.”

Compatibility matters too. Some lumbar supports are made only for specific chair models or require a backrest with a track, straps, or an attachment point. If you’re replacing a worn pad, confirm it fits your chair before ordering. If you’re shopping for a new chair and lumbar support is a priority, a built-in adjustable mechanism is usually more durable than a separate cushion.