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Herman Miller Mid Back Cosm Chair Leaf Arms in Nightfall

The Herman Miller Cosm Designed by Studio 7.5


£1,423.00 inc. VAT

Pay monthly with

Available as made to order

Please allow up to 20 working days for delivery.

Product Details

Mid back

Nightfall  Mesh Seat and Back

Nightfall frame and base

Auto harmonic tilt

Leaf Arms

Herman MIller Cosm receives a Red Dot Best of the Best Product Design Award in the “Office Chairs” category.

Studio 7.5 design team was inspired by Albert Einstein’s belief that “everything should be as simple as possible but not simpler”. They worked diligently to design a chair as intuitive as possible – both in form and function. If you are looking for a chair where less is more this is the one for you.

The Cosm chairs Auto-Harmonic Tilt works in conjunction with the chairs flexible frame and Intercept suspension material (mesh) to create total comfort and support. The tilt instantly and automatically provides balanced support and movement depending on your body and posture. The Intercept Suspension is breathable and temperature-neutral while the continuous form of the suspension conforms to each person’s body.

Introducing Leaf Arms

To offer as much comfort and ease as possible Studio 7.5 created Cosm’s Leaf Arms which feature a soft but firm cradle design that provides a large cosy resting place for your elbows. The sling design makes holding a phone or book natural and comfortable and the angle of the arms means that they don’t get in the way of a desk when it’s time to get back online.

Cosm has achieved Ergonomics Excellence certification from FIRA


Sizing/Assembly & Warranty Information

  • Assembly
    Fully Assembly
  • Warranty
    12 Years
  • Overal Dimensions
    980mmm - 1140mm H x 740mm W x 678mm D
  • Country of Origin



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Delivery & Returns Information


Our standard delivery is FREE of CHARGE to the UK mainland. Items FROM STOCK we aim to Deliver in 3-5 working days  (unless otherwise stated) MON- FRI  8AM TO 6PM .

* Excludes the Scottish highlands which is chargeable.

If the item is ( Made to Order) you can find the lead time under the Add to Basket Button (these are as accurate as possible)

Products showing PRE ORDER are items we have coming back in to stock and the dates are on the product pages. When you buy a pre order item it is reserved and when it arrives with us we ship it on to you please allow 3 working days after date shown for delivery.

We also ship to NI, ROI and the Channel islands also Mainland Europe.

For more information, please visit our dedicated Delivery Information page.

Easy Returns

All items listed as in stock can be returned or exchanged easily. The item must be in the original packaging and in New Condition and unused! You have 14 days from the date the item was received. We can arrange the return for you.

Please advise of the order No, address and contact details in the email sent to

For more information, please visit our dedicated Returns, Exchange & Refunds page.

Auto Harmonic Tilt

The tilt instantly and automatically provides balanced support and movement, depending on your body and posture.

no adjustments necessary

Intercept Mesh Suspension Seat & Back

Breathable and temperature-neutral, the continuous form of this elastomeric suspension eliminates the gap between the seat and back, conforming to each person’s body to provide dynamic spinal support.