Spinalglide Executive Glider EX Office Chair - A Revolutionary Chair That Provides Mobility While Seated Split-Seat technology enables tailbone to float freely, preventing lower back pain even after hours of sitting Spring-Supported Split-Seats enable the pelvic bones to move freely, maintaining free blood flow and enabling you to sit for extended periods of time RSI-preventive Thorasic backrests with amazing Lumbar Support Adjustable seat height, seat and back tilt. Adjustable arm height and angles, and lots of other features