**DELTA Plus Comfort Duo High Back is discontinued and now superceded by the DELTA 135 High Back**
This "split seat" feature is designed to slightly open the users pelvis to promote a straighter sitting position for excellent comfort.
The chair features a ratchet back, seat height, seat tilt & back tilt adjustments.
Delta Product Brochure
Comfort Duo Explained
3 Lever Ergonomic - Seat Height, Seat Tilt & Back Tilt