This chair doesn't have a separate lumbar support and instead features what Boulies describes as "dyanmic back support". The base of the back of the chair adapts to your posture and supports your ...

Transform your workspace with an ergonomic office chair designed to support your posture and enhance comfort while working.

I’ve also noticed my recurring shoulder and neck pain doesn’t bother me when I’m sitting in the Aeron, which I attribute to the chair’s back support, which encourages a more upright posture.