Mid-Back Cosm Chair


Designed by Studio 7.5



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Mid-Back Cosm Chair

Mid-Back Cosm Chair

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Item Number: 100114979

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Item Number: FLC152SFH9898VPRBKSVPR84503


A balance of sculptural form and effortless function, the Mid-Back Cosm gives you instant comfort—anywhere you work. It was designed to be as ergonomically innovative as it is beautiful and provide a universal solution for homes and offices.
Key Features
  • 12-year warranty
  • Named 100 Best Inventions by Time Magazine in 2019
  • Auto-Harmonic™ tilt mechanism automatically adjusts
  • Flexible frame
  • Continuous and breathable seat and back
  • One adjustment for height
  • Available in three arm styles: Fixed, Fully Adjustable, and Leaf
  • Dipped-in-Color option
  • Made in Michigan at a 100% green-energy facility
  • For questions about lead times, in-stock options or delivery please give us a call at 888.798.0202.
Mid-Back Cosm Chair


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Packaging Type:
Packaging Dimensions:
26" x 21.75" x 33.75"
Package Weight:
Mid Back: 41 lbs
Assembly Required:
Care and Maintenance


With regular care and maintenance, your Herman Miller product will provide many years of superior performance and satisfaction. To maintain quality, please follow the cleaning procedures outlined here.

The instructions for the care and maintenance of Herman Miller products are provided to you as a service. No warranty is implied since results may vary.

Care and Maintenance Guide



User Adjustments
Total Height 38.9-45.5"
Width 26.7-29.3"
Depth 26.7"
Seat Height 14.8-21.4"
Seat Width 20.5"
Seat Depth 15.9"
Arm Height 7.3-11.7"


0 reviews Be the first to review the Mid-Back Cosm Chair
3.7 / 5.0
10 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Pandemic Work from Home
I purchased the Cosm chair because i could get it faster than an Aeron with the options I wanted during Corona. Expect to adjust the chair height so your legs are pretty much at or just above a 90 degree angle. If you have it too low you won’t get a ton of resistance from the harmonic tilt and the chair will lean you all the way back. Pretty neat once you set it to a height that balances the chair. Other than that, it’s been a life saver for working from home.
May 6, 2020
2 months ago
Comfortable chair, but one main drawback
Overall, love the chair. Very comfortable to sit in for long periods of time. Good resistance so it doesn’t lean back when I don’t want to, but easy enough when I do. My only gripe is that the armrests are too far apart for me. Sitting so for table at my desk typing on a keyboard, I have to angle my elbows out a little to catch the armrests. Wish there was some adjustability there or it was a few inches closer.
May 1, 2020
2 months ago
Better than my Aeron
I was going to get a Sayl to replace my Aeron chair. After a long sit test, I found this more to be more comfortable than Sayl and Mirra. Reclining on this chair is much smoother than Sayl and the back doesn't cut into your shoulders.

The low back variant is not as comfortable for someone tall and I opted against the high back in case I get too relaxed while seated
January 8, 2020
Very disappointed
The chair came it broken and still waiting for replacement in which supposedly to be sent on 10/24/19 yet didn’t get any shipping detail as of now.
October 27, 2019
8 months ago
Response from Herman Miller
I'm so sorry to hear your chair arrived damaged. I do see that your replacement shipped on 10/24. I will reach out to you by email to make sure you have all necessary information and that the rest of your replacement process goes smoothly.
October 28, 2019
Melissa M
Lack of ergonomic support
The chair has only 1 function, adjustment of height, that's all. You can't even lock the chair upright.

No tilt limiter.
No tension control.
No adjustable lumbar.
No fully adjustable arms.
No seat depth adjustment.

If the chair's default adjustment is not suitable, which was what I was facing, that's it.
September 4, 2019
Response from Herman Miller
I'm so sorry the Cosm Chair isn't working out for you. The Cosm Chair was truly designed to be a fully automated chair, self-adjusting with no necessary adjustments other than seat height. I'm reaching out to you by email to learn more about your purchase.
September 5, 2019
Melissa M
Chair is great
The chair is much better than I hoped it would be. I have a bad back and this chair was very helpful.
July 26, 2019
11 months ago
Renata R.
I have no idea why I let my back suffer all this while without a proper work chair. My back issues have improved dramatically, especially my neck and slump. They must have done a good amount of research to create this specific chair, it provides comfort and ergonomic back care for sure. I love the mesh feature, it cradles me like a solid hammock throughout the day and I'm so glad I've made the investment.
June 25, 2019
Only one flaw, but it's major
If it weren't for one glaring flaw, this would be the best chair I have ever sat in. The mesh provides remarkable support while remaining breathable. The construction felt bullet proof. The look is super sexy.

The issue? You can't lean back without any amount of weight or you end up fully reclined. This was intentional on HM's part as the chair is supposed to sense your weight and recline the perfect amount. Trouble is, it doesn't work right. Mine let me fall all the way back after putting maybe 40% of my weight backward.

This chair is perfect, except that I had to return it.
March 19, 2019
Comfort and Style
Amazing! I have lower back issues that are made worse from sitting long hours at work. I wanted something with lumbar support, but didn’t look orthopedic. For the first time in years I can sit for hours and have no back pain! And the chair looks so stylish.
December 16, 2018
1 year ago
Love it
I just built a new house and ordered this chair for my office. I love how this chair is comfortable without having a dozen knobs to adjust. It just works.
November 11, 2018
1 year ago

Product Q&A

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Browse 2 questions Browse 2 questions and 2 answers
Where is the Cosm chair manufatured?
Peter T on Nov 14, 2018
Best Answer: The Cosm Chair is manufactured at our headquarters in Zeeland, Michigan.
is the height adjustabile?
Robert P on Jul 18, 2019
Best Answer: The seat height is adjustable on the Cosm chair. The seat height ranges from 14.8-21.4".