The big boy attachment makes my Vyper chair more usable.
See It Before You Buy It.
See why customers are upgrading their Vyper chairs with our most popular accessories.
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BIG BOY ATTACHMENT
$195
1,950 ENTRIES
1,950 ENTRIES
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Win a 2025 Polaris XP 1000. Every $1 you spend through October 18, 2026 is an automatic entry. Learn More
BIG BOY ATTACHMENT
$195
1,950 ENTRIES
1,950 ENTRIES
Polaris RZR 1000 XP Giveaway
Win a 2025 Polaris XP 1000. Every $1 you spend through October 18, 2026 is an automatic entry. Learn More
Proudly Designed & Manufactured in the USA
Safe, Durable & Reliable
Fast & Free Shipping
100% Money Back Guarantee
Other Great Accessories
SPECS & DIMENSIONS
DIMENSIONS14"x22"
ADJUSTBLEN/A
Cushion Thickness4"
FitsRobust & Elevated Steel Max, Robust Steel Pro
MADE INWisconsin, USA
ARE A BIG GUY AND TIRED OF SEATS THAT AREN'T BUILT FOR YOU
ARE AVERAGE FRAME AND JUST WANT THE CHAIR TO FEEL MORE SOLID
ARE GETTING OLDER AND NEED HELP PUSHING YOURSELF UP TO STAND
VALUE COMFORT OVER SAVING A COUPLE HUNDRED BUCKS
BUILT IN WISCONSIN
Every Vyper chair is hand-built in Green Bay, Wisconsin. No cheap parts, no shortcuts. Every component fabricated by Americans who give a damn about what they build.
30-DAY RISK-FREE TRIAL
Sit in it for a month. Roll it across your shop floor. Beat on it. If it's not the best chair you've ever owned, send it back for 100% of your money.
SHIPS FREE & FAST
The BIG BOY ATTACHMENT ships free to your door from our Wisconsin facility. Most orders go out within 48 hours, and you'll get tracking the moment it leaves the dock. No surprise fees, no third-party warehouse delays.
GOOD GUY WARRANTY
Stuff happens. A caster wears out, a bolt strips, a weld doesn't hold. If rare event ever happens, send it back and we'll replace it. Frame, casters, and hardware are covered for life. Everything else is covered for 5 years.
WHERE THE PROS SIT.
Vyper gear and equipment is trusted by the best in the business.
01/06
Customer Reviews
Overall rating: 4.9 / 5 from 629 reviews.
Love the quality. I do find I have to be careful getting on so it doesnt roll away from me
The Big Boy attachment is a great addition to any chair belonging to a heavy bodied user. It adds just the right amount of extra support for your buttocks if you are sitting for any length of time. It is a great addition to an already great chair!
I freaking love this stool and big man seat highly highly recommend this setup
make a great deal difference in comfort
Loved it easy to add to your reg chair
A must have
Outstanding product!! Fast shipping made in the USA!! Absolutely love it. Thanks
Excellent product. Functions as advertised.
I bought it for my husband. So far, he’s pleased with it.
Love the big boy attachment, adds a lot of comfort to an already really comfortable shop chair, particularly because it has the backrest. I was finding it hard to get the chair backrest straight in line with my back when sitting on it (I have the elevated model and it’s at bench height plus I am a little vertically challenged, so I have to tip toe to get up into the chair) the seat would rotate as I got on it, misaligning the backrest. It was possible to align but took extra effort to do after getting on, the big boy attachment squares the seat so you naturally sit right in line with the backrest, it puts the back of the chair right where it should be. Also, because I normally sit a little further back on a backless stool, I am forced a little forward with the backrest, so when my legs would wrap around the sides they are pushed more forward, the extra room on the big boy attachment gives them support, which makes the entire chair much more comfortable than a stool. My only complaint is that I purchased the Ford edition chair with blue stitching and the big boy didn’t have an option to match. Not a big deal, just a small detail. Would definitely buy again if I get a second chair for the other section of my bench that has a stool there now.
It is comfortable. The installation was a little confusing but logic won out and everything came together nicely.
Still waiting on my adjustable back rest
I bought this as a shared chair for both of us.. and I'm Quickly seeing that it will be short lived and when I can work it into our budget .."one of us" will have to be giving up their share of the current chair for a new one!!! Thank you for this truly great experience!...sincerely..
Nice product with defective stitching in one pad, Vyper sent a replacement pad with same defect. The other pad is fine. Kind if disappointing but it is functional.
The Big Boy gives me plenty of room for comfort and support.
Great accessory really enhances the comfort of the chair.
I was told by Rachel
I bout two and they are awesome I only issue is I only bough one big boy attachment I will be coming back for the second one shortly
Perfect addition
Fun to put together ! I am a CAD dental designer, my new stool is way better than my old one. I looked at few stools at some retail outlets. I never saw a Vyper stool in person only on TV. It is way better than anything I looked at! The fit and finish is awesome! I just put it together today. The seat is unbelievable. Looking forward to doing my job next week in it. GAME CHANGER!
Pure quality! Extremely happy with my purchase.
The big boy attachment is THE most necessary accessory for a Vyper chair if you’re a legitimate big boy like myself. It’s worth every penny and makes this seat so much more comfortable compared to the stand alone seat
Good quality product. Some extra hardware was supplied and 4 bolts holding the backrest were not provided. Had some of my own to complete the project.
Very impressed with the quality! Wish i had two butts, would by another!!
Send the shoes before the laces I dont have any chairs, very shitty way to do business
Nicest chair ever, a little expensive, $1200.00, but worth it. wish Vyper had a package price for everything instead of buying everything seperate.
Nice addition to the seat for extended sessions of working in comfort.
A 14” diameter seat is to small you might want to try a 16” diameter seat on your standard stools, the big boy seat made it really comfortable to be able to sit on it for hours at a time. I am retired and needed the extra leg support I spend most of my time in the garage watching NASCAR and other sports, I saved the box just in case I wanted to return it but that’s not going to happen. Thank you for a great product.
I love the big boy attachment I am a big guy and needed the extra cushion on both side it really made a big difference when I am using it in the garage. Another quality product from Vyper.
these are super great chairs !!!! And the casters actual roll so easy . They're the best .
High quality as is all the Viper items. It is unfortunate that you have to spend an additional $200 to get a comfortable seat on a $700 chair.
Purchased the Big Boy attachment for the taller seat also along with the adjustable backrest. Perfect king’s throne for the shop, just got to keep others out of it now. Planning to purchase the Big Boy attachment for the shorter seat will be a nice add on. Very happy with my choices.
Great customer service! I originally had called with a warranty issue, (the locking mechanism to position the the seat height had worn out), but the customer service person was so nice I ordered an upgrade for my chair! When I described my chair problem the technician quickly understood and offered sending the replacement parts needed. Then when I considered buying the upgrade parts, he offered to send everything without charging for shipping. You guys make great products and take good care of your customers after the sale. It's a real plus that, when calling customer service, I spoke to an agent in the United States. Also a big plus, I'm proud to say your products are made in America! By the way, my co-workers at Honeywell Aerospace are very envious of my chair. In fact, my shop purchased several Viper chairs since I purchased mine.
Very well constructed
This came with the DIY bundle. I'm not really a widebody but it would be great for full-bodied folks.
I already mentioned this in my initial post, but the additional comfort provided by "The Big Boy" seat cushion extension is phenomenal if you spend considerable time seated while working on lengthy projects.
Great chair rolls around perfect in my shop. Glad I ordered the big boy attachment. That makes a huge difference now you got comfort for all day sitting.
Just got it together about a week ago so far so good. I love the mobility with a bigger wheels and that comfortable seating
Just got all my attachments to it love the seat. Nice smooth chair rolling stool
Frequently Asked Questions
Everything you need to know before you upgrade.
What accessories are available for Vyper chairs and stools?
The most-purchased Vyper accessories are the Adjustable Backrest, Adjustable Armrest, Big Boy, Tool Tray, and Sidekick. Each one solves a specific problem:
- Adjustable Backrest: Replaces the stock backrest with a 10° tilt and 4" of height adjustment, for buyers who want to dial in lumbar support exactly.
- Adjustable Armrest: A solid grip for sitting down and standing up, and most importantly, to improve posture / stability.
- Big Boy: Adds 7" of seat width, for larger frame buyers or anyone who wants more room and stability.
- Tool Tray: Bolts to the underside of the chair to hold sockets, loose bolts, and shop rags.
- Sidekick: Side-mounted attachment with cup holders, a tool holder, and storage for spray bottles, polishers, and shop towels.
All accessories are made in Green Bay, Wisconsin and ship with the same warranty and 30-day guarantee as the chairs themselves.
What's the difference between the Sidekick and the Tool Tray, and do I need both?
The Sidekick mounts on the side of the chair for what you're actively using (spray bottles, polishers, microfibers, a cold drink), while the Tool Tray bolts underneath for what you've already used or what might fall (loose bolts, dropped sockets, shop rags, small parts).
They're built to work together, not against each other. Detailers and fabricators who run the Complete Package (Robust Steel Max + Tool Tray + Sidekick) consistently say the two-accessory combo turns the chair into a real mobile workstation. Sidekick at hand for the polisher you're using right now, Tool Tray below for the spent microfibers and parts. If you can only pick one, the Tool Tray is the accessory most buyers later say they wish they'd added from day one.
Can I use the Big Boy and the Sidekick together on the same chair?
No. The Big Boy and the Sidekick cannot be installed on the same chair, they mount in the same location and you have to pick one. Our specialists at (920) 301-3822 can walk you through the right choice if you're not sure.
The decision is usually clean. If you're a larger-frame buyer (or an older buyer wanting more leverage when standing), get the Big Boy. If you're a detailer, fabricator, or anyone who works with supplies at the seat all day, get the Sidekick. The Adjustable Backrest, Adjustable Armrest, and Tool Tray all work with either choice, so you don't lose any other accessories by picking one over the other.
Is the Adjustable Backrest worth the upgrade over the stock backrest?
For most buyers, the stock backrest is built right and works exactly as designed. The Adjustable Backrest is the upgrade for the buyer who lives in the chair, taller height range, up to 10° of recline, and the ability to dial in the support position to your specific body and the way you actually work.
Roughly half of buyers add it during initial chair configuration. The other half buy it months later, after deciding they want to fine-tune the backrest position even further. Reviewers consistently describe it as the upgrade that turns the chair from "comfortable" into "I never want to get up." Compatible with the Robust Steel Max and Elevated Steel Max chairs, and pairs with either the Big Boy or the Sidekick.
Who should buy the Big Boy attachment?
The Big Boy adds 7" of additional seat width, built for two specific buyers: larger-frame customers (280 lbs and up, or anyone who finds the standard seat too narrow) and older buyers who want more leverage when sitting down and standing up.
Reviewers consistently call it a confidence upgrade. The wider seat means you don't have to perfectly center yourself when sitting, and the wider surface gives you something to push off when standing. It's the most-recommended upgrade in the Vyper review base for buyers in their 60s, 70s, and 80s. Available on all Vyper chairs except the Low-Pro and Robust Steel Sport. Cannot be combined with the Sidekick.
Can I add Vyper accessories to a chair I already own?
Yes. Every Vyper accessory is designed to bolt onto chairs already in your shop, you don't have to buy them at the same time as the chair. Roughly half of buyers add accessories during the initial chair configuration. The other half buy them weeks or months later, after deciding what they actually need.
The Tool Tray, Sidekick, Big Boy, Adjustable Backrest, and Adjustable Armrest all install with basic hand tools and ship with instructions and hardware included. If you bought your Vyper chair years ago, the accessories from today's lineup are still compatible with the standard chair models. Call (920) 301-3822 if you're not sure whether an accessory fits an older chair.
Which Vyper accessories work with the Low-Pro and Robust Steel Pro stools?
The Vyper Backrest add-on works on the Robust Steel Pro and the Low-Pro Backrest works on the Low Pro, for buyers who started with a stool form factor and decided they wanted lumbar support after the fact.
The Big Boy is not compatible with the Low-Pro, but is compatible with the Robust Steel Sport. The Tool Tray and Sidekick are designed primarily for the Robust Steel Max and Elevated Steel Max chair frames. For a stool-specific tool-holding solution, the Robust Steel Pro ships with a built-in stationary tool tray as a standard feature, no add-on required.
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