What is the difference between a mid-back and high-back office chair?

Mid-back chairs have a backrest extending to approximately shoulder blade height (18"–22" from seat) — no head/neck support. High-back chairs extend 22"–30" from the seat and include a headrest — better for extended sitting and users with upper back or neck discomfort. FindOfficeFurniture.com carries both configurations — call 888-719-4960.