Replacement Seat for Herman Miller Classic Aeron Size B Medium (Black Mesh)

I have an Aeron chair (size B) that I bought in the late 90s. A few years ago the seat started to tear. Not bad after 20+ years of almost daily use. I bought a replacement mesh which turned out to be a bad idea. It didn't quite fit and it wasn't made of the same stretch material as the original seat. Ok, lesson learned there. So I bought this and it was a perfect replacement. It's an entire new seat, not just the mesh. The mesh is the same stretchy material as the original. It looks identical to the original seat as far as I can tell. Replacing the seat was pretty easy. The instructions were good and it came with the tools needed. I think it took about 20 minutes and I was done. If you've made an investment in this chair, I think it's worth it to spend a little more getting this replacement seat so you have the official product. I'm writing this review 2.5 years later in Feb 2026 and the seat is still great. Zero problems, no regrets.

This replacement seat for my Size B Aeron chair fit perfectly and matched the original in both comfort and quality. The mesh feels sturdy, supportive, and identical to what came with the chair originally. Installation was simple, and once it was on, I honestly couldn’t tell the difference. If you’re looking to refresh your chair without replacing the whole thing, this is the way to go. Solid product.

This is a perfect fit for our Aeron chair that fell apart after more than 25 years of use. It seems to be as good quality wise as the original and was straight forward to install. Very comfortable with the same feel as the original.

I have ordered many things that require tools that are supplied, and none would I ever keep. This product came with all the required tools and they are good quality tools, after using them I put them in my tool box. Everything in this order was top notch, from the tools to the packaging. The seat came is a resealable insulated reusable carry bag, perfect for reuse as a bag to bring home frozen food from the store. This is defiantly what I needed to repair my Herman Miller chair, thank you for selling such a perfect product.

A very uncomfortable replacement for the original seat. There is a ridge of foam at the front edge that hits right across the back of the thigh that isn't there in the original - I compared them. The whole point of the real Aeron seat is that it doesn't do this, you can sit for hours without your legs getting constricted. This is really uncomfortable and I'm thinking about returning it. Trouble is that it was such trouble to install I don't want to have to do that again. I'll live with it for a couple of days and see how it goes. But if I were to try this in a store I would definitely not buy it. Update, after sitting on it for a couple of hours I'm returning it. This is nothing like the real thing. It's so uncomfortable that it's unusable. With my old seat restored, though not perfect, my chair now feels right again. Final grace note: the tools supplied DON'T FIT and are useless. I used my own tools to make the original swap but tried theirs for the restore, The big hex wrench that fits the hip bolt does fit, but the others don't. So you'll need your own tools. Word of warning, the smaller wrench for the seat bars is NOT 4 mm. It's maybe 3.5. I have no explanation for all the favorable reviews. I downgraded from 2 to 1.

This is a third party replacement for the seat of an Aeron chair size-"B". It fits PERFECTLY for a size B. If you read someone complaining that it doesn't fit, it is because they ordered the wrong item OR the wrong item was shipped to them. But the item listed here, the one I have received fits a size B perfectly! NOTE: The amazon listing has clear images showing the dimensions of a size-B and size-C chair seat. It also has (and I found this to be the most useful) an image illustrating how the back of the chair has TWO screws for a size-C chair and ONLY ONE CENTERED screw for a size-B chair. I included a photo of my size-B chair for illustration. The good: - It fits perfectly and it's easy enough to replace. The Bad: - The product arrived with a torx screwdriver instead of a 4mm hex key. If you have a set of hex key at home, you're good. Otherwise get one here with a 4mm key. (Note: I only had an imperial set of hex keys and I found and used on that was close enough to hold securely) - The instructions are terrible (mostly ass covering with CAUTION boxes). But it's easy to install. Here are the simpler instructions: Removing the old seat: 1) Remove the large side screws holding the seat of the chair using the larger 6mm hex / Allen key 2) Remove the 2 sets of nuts/bolt forming the "collarbone" connector below the chair, using the provided 10 mm socket and the (or your) 4mm hex / Alen key Putting in the replacement seat: 1) Attach and screw in the 2 sets of nuts/bolt forming the "collarbone" connector below the chair, using the provided 10 mm socket and the 4mm hex / Alen key. ** IMPORTANT** do these ones first or (like me) you will have to redo it... if you put the larger screws in first, you won't be able to access the space to put in those smaller ones after. 2) Align the seat, insert and screw in the large side screws holding the seat of the chair using the larger 6mm hex / Allen key Conclusion: Bad instructions, wrong tools (but hey, they **included** tools, so it's not too bad!). Great seat, that fits perfectly! Verdict: If you have a size-B chair and need a new seat: GET IT herre!!

I recently got a 2002 Aeron Classic size B locally from someone and the chair was in great shape, but the seat was sagging some. It was clear that just replacing the seat would probably be the best bet as it obviously takes the most beating. I was a little hesitant when ordering this because the price was good and the promise seemed big. It kept the promise and is great! It also comes in this insulated tote bag with all of the tools in their own zipper pocket and honestly, the bag itself is just a big bonus. Overall, I've had the seat for upwards of a week, sit in it daily for long periods of time and it feels great! It looks like the original, everything matches up well from a coloring perspective and the mesh looks the same. I really recommend it for anyone who needs a new seat.

I was skeptical about this product, but the seat frame on my original seat on my 25-year-old chair snapped. This was well packaged, easy to install, and looks/feels just the same. Just finished install, so I don’t know about longevity, but so far, this is perfect.