Color
Graphite
Herman Miller · 2018–Present
Cosm
Auto-Harmonic tilt and continuous suspension—instant fit with almost no knobs.
Bottom line
Cosm is for people who want instant fit with almost no knobs. Auto-Harmonic tilt and continuous Intercept suspension auto-balance; capacity is 350 lb. Choose low / mid / high back; Leaf Arms are common but are not full 4D articulating arms. No headrest path; forward tilt is not offered.
Where to buy
Typical prices — new ~$1,850, refurbished ~$900, used ~$550.
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Fit
Set your height and weight once — we'll check this chair and keep the profile for the rest of the site.
Units
Configurations
Available in Low-Back, Mid-Back, and High-Back.
Spec sheet
- Typical configuration
- Mid-back work chair with Leaf Arms
- Era produced
- 2018–Present
- Discontinued
- No
- Approx. MSRP (new)
- $1,850
- Typical refurbished price
- $900
- Typical used price
- $550
- Height range
- 152–191 cm
- Weight capacity
- 159 kg
- Seat width
- 51 cm
- Seat depth
- 43 cm
- Backrest height
- 61 cm
- Seat material
- Elastomer
- Armrest type
- 3D
- Arm adjustability
- Leaf arms, height-adjustable, fixed, or armless depending on config
- Forward tilt
- No
- Lumbar
- Integrated
- Headrest
- None
- Cylinder
- Top-activated pneumatic (~16.4"–20.9" seat height typical)
- Caster stem
- 11mm × 22mm standard
- Frame
- Flexible polymer frame + elastomeric Intercept suspension
- Tilt / lock
- Auto-Harmonic tilt (automatic balance; minimal manual dials)
FAQ
- Which Cosm back height should I buy?
- Mid-back is the everyday work silhouette. Low-back suits collaborative/casual movement; high-back adds upper-thoracic coverage.
- Does Cosm have fewer adjustments than Aeron or Embody?
- Yes. Auto-Harmonic tilt removes most tension fiddling. Aeron and Embody reward users who want explicit size or spinal fine-tuning.
- Are Cosm Leaf Arms fully adjustable?
- No. Leaf arms are height-oriented / wrap-style options—not full 4D articulating arms. Fixed and armless configs also exist.
Revision matrix & serial tag guide
Serial tag location: Underside of seat; Cosm is identified by continuous Intercept suspension seat-to-back.
| Year | Version | Changes |
|---|---|---|
| 2018 | Launch | Auto-Harmonic tilt, Intercept suspension, low/mid/high back, Leaf Arms option. |
Aftermarket & replacement parts
Compatible cylinder type: Top-activated pneumatic (~16.4"–20.9" seat height typical). Caster stem: 11mm × 22mm standard. Headrest availability: None.
Spec notes
- Often cited around 5'0"–6'3"; typically covers roughly the 5th–95th percentile.
- Seat width and depth are approximate for common configurations.
- Leaf arms are not full 4D articulating arms.
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