LeanRite usability testers ranging in height from under 5'0" to 6'4" tall reported that they were able to comfortably use our standing desk chair. The recommended weight tolerance for sitting is 270 pounds. People over 6'4 can absolutely use the LeanRite for multiple perching positions and sitting, but may find the lumbar lean position to be low. People of shorter stature may benefit from adding a foam footrest when in the fully seated position. We recommend a specific non-slip model that we now offer in our online store. Click here for a more detailed overview of the LeanRite standing desk chair's specifications.