The ergonomic Alpha chair from Sitmatic offers:

• PostureBack mechanism allows the backrest to rock with a fixed seat, seat slider, high density foam, and adjustable armrests options.
• SingleTouch mechanism that has independently adjustable seat and backrest that lock after adjusting.
• SynchoExec mechanism that has a rocking seat and backrest plus independently adjustable angle between seat and backrest.

Armrest options:

1N:  Adjustable height and width.

1A:  Adjustable height, width and angle.

1M:  Adjustable height , width and angle with wide memory foam armpads.

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PB PostureBack™Rocking backrest with fixed seat.  An ergonomic choice for multi-task work (computer, phone etc.).The PostureBack control features a free floating, tension adjustable rocking backrest that can be locked into eight different positions. Seat is fixed at -8° and backrest moves through 23° (89°to 112°). An “anti-slap” function prevents the backrest from inadvertently releasing unless the Alpha chair is occupied. Seat height adjusts pneumatically. Backrest height adjusts four inches into eleven different positions using a ratchet; simply lift and click into place.

SX SynchroExec™
Rocking seat and backrest plus independently adjustable angle between seat and backrest. The best choice for multi-task work (computer, phone etc.). The entire Alpha chair rocks in a synchronized freefloat mode. Adjustable tension and lockable in eight different positions. Backrest reclines 31° (89° to 120°) while the seat reclines 10° (0° to -10°). Rocking is “knee-tilt” keeping the user’s feet on the floor. Also, the seat to backrest angle is independently adjustable 16° for fine tuning upright posture. “Anti-slap” prevents the backrest from inadvertently releasing unless the Alpha chair is occupied. Pneumatic seat height adjustment. Backrest height adjusts four inches into eleven positions using a ratchet; simply lift and click into place.