Office Chairs, Leather Chairs, Reception Chairs - Brands include Hon, Mayline, Global, Alera etc.

With mid-range knee tilt, the pivot point for the recline mechanism is half-way between the stem and the front edge of the seat. The front of the seat rises a shorter distance than the back when reclining.	With full knee tilt, the pivot point for the recline mechanism is located near the front edge of the seat. The front of the seat hardly rises at all when reclining.	Back reclines at a 2-to-1 ratio to seat angle. Pivot point located near front edge of chair. Sychronized knee tilt combines the limited front rise of a knee tilt chair with the smooth, responsive motion of synchro-tilt.	Back reclines at a 2-to-1 ration to seat angle. Allows user to recline while keeping seat cushion relatively level to floor. 11 degrees of seat tilt and 22 degrees of back recline.	This is a function of the height and weight of an individual. The taller and/or heavier the person, the need for a tighter tilt tension. The opposite for a shorter, lighter person, the lighter the control.	Locks out tilt function when chair is in upright position.

Back angle adjusts independently of seat, and can be locked in an infinite number of positions withina fixed range.	Adjusts seat and back angles independently with a single lever (infinite locking within a fixed range).	This is a multi-action system that allows for three seperate functions. The back pivots independently of the seat, and can be locked in an infinite number of positions within a fixed range. The seat tilts, with the pivot point directly above the chair stem. The chair can tilt freely, or be locked into an infinite number or positions within the tilt range.	Regulates the height of lumbar support independent of the seat back. Easily adjusts to enhance comfort (2 1/2" adjustment range).	The dual-clutch posture control is specially engineered to stand up to heavy use and abuse. The back and seat operate around totally different pivot points, to accomodate users of differing body types in multi-shift environments.	Back reclines at a 2-to-1 ratio to the seat. Chair can tilt freely, or lock in five positions. "Forward angle" control provides an extra 5 degrees in the range of motion.

Now that you know what the features mean.   What functions should a good ergonomic chair offer?

Seat height should be easily adjustable. A pneumatic adjustment lever is the easiest way to do this. A seat height that ranges from about 16 to 21 inches off the floor should work for most people. This allows the user to have his or her feet flat on the floor, with thighs horizontal and arms even with the height of the desk.

Seat width and depth. The seat should have enough width and depth to support any user comfortably. Usually 17-20 inches wide is the standard. The depth (from front to back of the seat) needs to be enough so that the user can sit with his or her back against the backrest of the ergonomic office chair while leaving approximately 2 to 4 inches between the back of the knees and the seat of the chair. The forward or backward tilt of the seat should be adjustable.

Lumbar support. Lower back support in an ergonomic chair is very important. An ergonomic chair should have a lumbar adjustment (both height and depth) so each user can get the proper fit to support the inward curve of the lower back.

Seat material. The material on the office chair seat and back should have enough padding to be comfortable to sit on for extended periods of time. Having a cloth fabric that breathes is preferable to a harder surface.

Armrests. Office chair armrests should be adjustable. They should allow the user's arms to rest comfortably and shoulders to be relaxed. The elbows and lower arms should rest lightly, and the forearm should not be on the armrest while typing.

Swivel. Any conventional style or ergonomic chair should easily rotate so the user can reach different areas of his or her desk without straining.

You might also consider purchasing a chair mat to reduce fatigue by allowing for easier rolling across your workspace with less back and leg strain.