What is a synchro-tilt mechanism on an office chair?

A synchro-tilt mechanism links the backrest and seat so that when you recline, the seat tilts at a lower ratio (2:1 or 3:1) than the back — keeping the thighs relatively level and maintaining a more comfortable hip angle during recline. Synchro-tilt is the standard mechanism on mid-range to premium commercial chairs. Multi-function mechanisms allow back and seat to be adjusted independently. At OfficeFurniture2go.com, chair specs note the tilt mechanism type — call 1-800-460-0858.