The shape of our spinal columns is as unique as our fingerprints, including variations in the curvature and length. Over the course of a day, our individual spinal length even varies by as much as 2 cm (approx. 0.8″). The seat back plays a critical role in supporting the spine and must adjust to accommodate these differences among people.

A very important consideration in seating comfort and injury prevention is the proper design of the lumbar support. Lumbar support is provided with different levels of performance as follows:

Performance of Lumbar Support
Minimum Fixed Support — Based on seating standards, a curvature is designed into the lower seat back to support the lumbar spine. Unfortunately, one size does not fit all.

Good Single-Axis Adjustable Support — The lower back seat curvature is adjustable in at least one direction. Typically the curve may be raised or lowered.
Better Dual-Axis Adjustable Support — The lower back seat curvature is adjustable in two directions.

This would include 4 inches of height adjustment as well as depth adjustability of the lumbar curve.

Best Asymmetric Adjustable Support — This offers the highest available performance. Comfort is greatly enhanced by allowing users to adjust the height by 4 inches as well as independently adjust support on either side of the spine.

Asymmetric Lumbar Support
Recent independent university research has indicates that over 74% of individuals tend to prefer more support on one side of their lower back than the other.

Dual Axis Adjustable Support