Seat Depth Adjustment
The Mirra comes with either a fixed seat depth of 17" or the upgraded FlexFront Adjustable Seat Depth. The FlexFront adjustable seat depth adds a range of depth from 17" to 19". If you have long legs or are over 6' tall you will want this feature. If you are short, you can skip this one. Yay for short people that can save $50 on this
feature they will never use! If this is a shared chair (i.e. husband/wife office) opt for this feature for added adjustability.