Herman Miller Cosm Medium Back Graphite Office Chair - Fast Delivery
The Herman Miller Cosm Medium Back Chair offers advanced ergonomic comfort, responding instantly to your body, posture, and movement to provide natural balance and full support.
Please note: The Cosm chair features a unique gas lift with a softer, suspension-like feel, similar to sitting in a car seat. Additionally, the internal mechanism may produce some sound when adjusting or shifting position, which is a normal characteristic of the design.
Key Features:
- Medium back
- Graphite frame & base
- Height adjustable arms
- Choice of castors
- Seat height adjustable
Wellworking Says...
"A flexible office chair that automatically adjusts when you sit and recline on it."
Herman Miller Cosm Medium Back Graphite Office Chair FAQs
What is the Cosm Medium Back?
A mid-height version of the acclaimed Cosm series (offered in low, mid, and high back). It offers automatic, balanced support with minimal adjustments and full ergonomic comfort.
How does the automatic tilt work?
• The Auto‑Harmonic™ tilt mechanism adapts intuitively to your body and posture, providing responsive recline without manual tuning.
What are the dimensions & capacity?
• Dimensions: Height 989–1,156 mm; width 734 mm; depth 678 mm; seat height 409–544 mm; seat width 521 mm; seat depth 404 mm .
• Weight capacity: Supports users up to 159 kg (25 stone).
What’s the warranty?
• Backed by a 12-year, three-shift warranty covering all components – structure, mechanics, castors and cushion.
Is the chair silent?
While most users report smooth and quiet operation, some have noted occasional “click” or “thunk” sounds—especially during return to upright posture. This is intentional in the tilt mechanism rather than a fault.
WARRANTY CLAIMS
All warranties are automatically applied by Wellworking and there is no need to register your product with the manufacturer.
Please keep your proof of purchase safe (it's easier for us to locate your order with the invoice or web order number) and, in the unlikely event a fault occurs, contact us by emailing service@wellworking.co.uk and we will arrange a service visit or replacement.
As a certified B Corp we are committed to putting sustainability at the core of all the products and services we offer.
Our products are designed with quality and longevity in mind and this is reflected in their long warranties.
We are working with our suppliers to reduce packaging and limit the use of non-recyclable packing materials. We take away all the packaging when we deliver products and recycle as much as we can within our offices to reduce the waste that goes to landfill.
