Cosm Chair Buying Guide & Size Chart

1. How to Choose Your Cosm Chair

Pick a Colour Combination

Cosm is available in a unique dipped-in-colour design where the frame, suspension, and base match seamlessly. 

Options include:

  • Canyon (red)
  • Glacier (light blue)
  • Nightfall (dark blue)
  • Carbon (charcoal)
  • Graphite (dark grey)
  • Mineral (light grey with white frame)
  • Studio White

For a refined aesthetic, you can also select premium finishes such as Semi-Polished Alloy or Silver Alloy.

Choose Your Back Height

Cosm is offered in three back heights, each designed for a different level of support:

  • Low-Back – Features a wrap top for freedom of movement and easy collaboration.
  • Mid-Back – Provides scapular support while remaining versatile in any setting.
  • High-Back – Cradles the upper back and shoulders for maximum support and an enveloping feel.

Select Your Arm Style

Cosm offers four arm configurations to match different preferences:

  • Leaf Arms – Exclusive to Cosm, flexible and soft for natural arm support.
  • Height-Adjustable Arms – Adapt the arm height for personalised comfort.
  • Fixed Arms – Streamlined and simple.
  • No Arms – A clean, minimal choice ideal for tight spaces.

2. How to Adjust Your Cosm Chair

One of Cosm’s biggest advantages is that it requires no complex adjustments. Its key technologies work automatically:

  • Auto-Harmonic Tilt – Instantly balances recline tension and support, responding to each person’s posture.
  • Intercept Suspension – A continuous, breathable mesh that eliminates gaps between the seat and back for full spinal support.
  • Flexible Frame – Slim yet strong, designed to flex with your movement while remaining supportive.

The only manual adjustment required is seat height, set via the lever under the seat so your feet rest flat on the floor.

3. Caring For Your Cosm Chair

  • Frame & Arms – Wipe with a soft cloth and mild detergent.
  • Suspension Mesh – Vacuum with an upholstery tool; for spills, spot-clean gently with warm water and mild soap.
  • Polished / Alloy Finishes – Use a non-abrasive cleaner to maintain shine.

4. Warranty & Support

Like all of our Herman Miller performance chairs, the Cosm is backed by a 12-year warranty, covering parts and labour. This ensures long-lasting quality and peace of mind.