The footring is located ~8 inch above the floor and allows you to rest your feet on it.
Q: What is the benefit of a foot ring?
A: When seated properly, your feet should be able to rest flat on the floor. If the desk surface requires the chair to be raised at a height where it allows the feet to swing loosely, then a foot ring is beneficial.
Q: Is the foot ring removable?
A: Yes. The foot ring can be removed