Rocking chairs are relaxing until you actually need to concentrate. This one solves that by letting the backrest lock at four fixed angles, 92, 98, 106, and 114 degrees, so a posture that suits typing can be held rather than constantly drifting. Release the lock and the same backrest rocks freely across a 90 to 118 degree range, with a tilt tension knob setting how much push-back you feel at each point. The 2D headrest is equally adjustable, sliding through 2 inches of height and swiveling 45 degrees to meet the back of the head at whatever angle you happen to hold it. What sets the shell apart is the wing design: the 20.5-inch by 24.5-inch backrest curves forward at both edges to wrap the ribs, so the body is held from the sides instead of only from behind, and support runs unbroken from head to back to arms to hips and legs. Skin-friendly suede covers a sponge fill that is supportive and elastic rather than soft and collapsing, finished with color blocking and a distinctive stitching pattern. The 21.5-inch by 17-inch seat swivels and lifts between 18 inches and 21 inches on an SGS certified gas rod, with 22.5 inches of clear space between the padded armrests, and the chair stands 27.5 inches by 25 inches by 46 to 49 inches overall. A heavy-duty five-claw metal base carries a 330 lbs load on a 39 lbs frame that moves easily across the floor. Assembly is required, and the chair suits working, gaming, reading, and resting alike. Specification: Color: Brown & Beige/Gray & Blue/Blue; Material: Suede Fabric; Overall Dimensions: 27.5" x 25" x 46"-49"; Size of Headrest: 13" x 7"; Backrest Dimensions: 20.5" x 24.5"; Armrest Spacing: 22.5"; Seat Dimensions: 21.5" x 17"; Seat Height: 18"-21"; Height Adjustment (Headrest): 2"; Rotation Angle (Headrest): 45°; Lockable Angle of Backrest: 92° 98° 106° 114°; Rocking Range of Backrest: 90°-118°; Max Load Capacity: 330 lbs; Net Weight: 39 lbs; Box Qty: 1; Assembly Required: Yes