High-Back Cosm Chair



Designed by Studio 7.5

The High-Back Cosm cradles your body while the Auto-Harmonic Tilt instantly responds to your movements. A balance of sculptural form and effortless function, Cosm is where performance meets beauty. And with dipped-in-color, experience it in one hue from top to bottom.

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High-Back Cosm Chair

High-Back Cosm Chair

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Item Number: 100128922

Ready to ship in 12 weeks

Shipping Info:
Item Number: FLC162SFPG1G1G1BKS84501
High-Back Cosm Chair


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Packaging Type:
Packaging Dimensions:
26" x 21.75" x 38.5"
Package Weight:
High Back: 43 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.


Frame, Base, and Standard Armpads

Normal cleaning

Wash surface with a soft cloth soaked in mild detergent and warm water. Rinse thoroughly and dry with a soft cloth. 

Do not use solvents or abrasive kitchen cleaners.

Suspension Material

Normal cleaning

Vacuum fabric as needed using an upholstery attachment. Vacuuming picks up dust and reduces the need for professional cleaning. 

Do not brush fabric or use a vacuum attachment with a rotary brush. Brushing may permanently damage the nap or change the character of the fabric.

Spot Cleaning

Immediately soak up the stain with a soft absorbent cloth.

Do not dry the stain completely or it may set. The longer a stain is allowed to remain on a fabric, the more difficult it is to remove.

Water-based stains such as coffee, soft drinks, fruit juices, or milk

Use a water-based cleaner (specifically made for cleaning fabric) or a solution of mild (alkaline) warm soapy water (not overly soapy) applied with a damp clean cloth or sponge. Work the cleaner into a lather or foam.

Never use hot water; it will set the stain. Avoid scrubbing.

Oil-based stains such as lipstick, grease, or salad dressing

Use a dry cleaning solution applied with a damp clean cloth or sponge. Test the cleaning solution on a small, concealed area first. If there is no spotting, ringing, or damage to the fabric or its dyes, apply the cleaning solution to the soiled area with light, quick strokes. Begin at the outside of the stain and work toward the center, being careful not to over-saturate the fabric.

K2R is also a product that can be used. See product label for complete instructions. Do not over apply water or any liquid solution to fabric. Excessive wetting of the fabric with any liquid solution may result in permanent damage to the material. Do not rub too vigorously or you may damage the nap of the fabric or break fibers. Several light applications are better than one heavy application. Soak up all remaining solution and then use another clean cloth or sponge dipped in cool water to remove any residue. Let fabric dry thoroughly and then vacuum well before using. If the stain resists cleaning, contact a professional cleaner.

Large Areas

If large areas are soiled, contact a professional cleaning firm.

  High Back
Total Height 44.9-51.2"
Seat Height 16.4-20.9"
Width 26.7-29.3"
Depth 15.5"


0 reviews Be the first to review the High-Back Cosm Chair
4.4 / 5.0
10 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Not great for light people
I love the comfort of this chair, but as I am on the underweight side it cannot tilt with minimal effort
February 9, 2019
Read this opinion from a real one time, first time buy customer with no experience in buying chairs.
As someone who values design, quality, simplicity, comfort and style it’s hard to find another chair in the market that has everything like the Cosm, in fact I couldn’t find another one. I was hesitant to spend that much on a desk chair for the home office, but the 30 day no questions asked return policy and the amazing customer support when trying to figure out what was the right chair for me helped me to make the decision and I’m glad I did. This chair is everything as advertised, do not think twice invest in your posture, your comfort and your experience. I really can sit in this all day and not feel like it! If your lower back hurts it’s because you’re not sitting in a position that supports it properly. Give it time and it will get better. 12 year warranty, $1200 chair = $100 a year for the best investment I’ve made in a while. Hope this helps other potential buyers make the decision, I will never buy another chair from anyone other than Herman Miller now.
January 17, 2019
Great chair after weeks of breaking in
Cosm chair is definitely an acquired taste. Perhaps because all my previous desk chairs have not been designed as ergonomically as the Cosm, I found the Cosm chair less than comfortable when I first started using it. It almost felt as if the chair was fighting my body and I was very conscious of the chair's impact on my body. However, after about 3 weeks, my body started to accept the fact that there was a proper way to sit and at that point, the benefits of the chair truly set in. Frankly, I don't think it will ever be as comfortable as a chair that allows poor body posture but I do feel that the long term benefit will be worth it.
January 6, 2019
3 months ago
The high back chair is very comfortable and supportive. I use it at my office desk and table. It is comfortable to use for computer work or for conference. I would recommend the chair.
January 3, 2019
2 months ago
My husband loves his Cosm!
I purchased a high-back Cosm for my husband who suffers from a rheumatic process that affects his shoulders and upper arms and to a lesser extent his hip joints. On average, he spends 10-12 hours per day sitting and working from his home office.

He is also very, very picky.

I am happy to say he LOVES his chair. He loves the design, color, and most importantly, how good he feels after a full day in the Cosm. Not having to extend, stretch, or contort to make adjustments for fit is great for him.
December 26, 2018
3 months ago
Very nice chair
Bonjour j'ai pas achetter ni jamais essayer cette chaise mais elle me semble pas mal cool
December 18, 2018
Seat seems too short
I spent time at a store today trying out the chairs. I almost walked out with a Cosm but the seat does not extend out far enough to support my thighs. I’m 5’ 11” so nothing unusual. But it felt like much of my butt would be bearing most of my weight and not distributed to my thighs. I wish that it came in different sizes. I didn’t buy it.
November 24, 2018
Quite exceptional. Very pleased. Only potential concern is the piston reserve when initially sitting down. I'm 6'4" and 270lbs. The piston bottoms-out and that may be worth a look. Otherwise, the benefits and utility of this chair far exceed what I've experienced over the last 65 years. Brilliant design. I am very, very pleased. Much prefer this to the Aeron. Nothing else like it.
November 3, 2018
5 months ago
Seat Issues
Just got the chair in last week. Today is my first time trying it out. The chair, though beautiful, after 20 minutes or so, I started feeling the frame pressing into the back of my thighs through the seat. It's quite uncomfortable because the frame is angled in such a way it feels like bars pushing into the sides of my legs. I am 6 foot 190 lbs.
October 30, 2018
I f---in love this chair.
I'm a software engineer and my boss just got me one of these high-back ones for my office and it's so comfortable.

Way better than my Aeron I got for my home office which was always size too big for me (I got it at discount, couldn't be selective with the sizing).

The Cosm seems to come in one-size-fits-all and it feels perfect for my 5-10 frame. I only wish they bought me a Leaf-armed one instead of the fixed, but either-way I work 90% of the time with my arms on the table on a Grifiti arm rest.

Great job Herman Miller. Worth every penny.
October 4, 2018

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