Bought this new and found it doesn't work on my tall-back office chair. Meant for the shorter variety.
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From the Manufacturer:
Ideal for those who spend long hours in the office, the Fellowes Professional Series Back Support with Microban Protection helps reduce back pain by providing support where you need it most. This back support features a two-tiered system that offers both mid-spinal support and lower lumbar support with memory foam cushions that conform to your body's natural curvature. The adjustable support fits most office chairs and includes Microban antimicrobial protection to help keep the product cleaner.
The Professional Series Back Support features soft, contoured memory foam cushions that conform to your body's natural curvature. One cushion in the mid-spinal region helps you maintain proper posture, while three memory foam sections provide lower lumbar support. The memory foam responds to your back's weight and warmth for customized support.
The back support is adjustable and fits most office chairs. Setup is easy--just place the support on your chair, position yourself comfortably, and clip the straps in place. The lower straps divide into two sections that wrap around the lower corners of the chair, while the upper strap comes over the top of the chair and attaches to the lower straps. This Tri-Tachment system holds the support firmly in place, eliminating the need for readjustment.