ProtoArc

ProtoArc Seat Cushion Office Chair Cushion for Sciatica Coccyx Cushion Ergonomic Memory Foam Seat Cushion for Car Home

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$24.99$46.99
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About this item

  • Innovative U-Shape Design: Unique tailbone cut-out for pressure relief, even weight distribution, and raised sides for hip support. Pre-shaped foam molds to your body for exceptional comfort and support. Upgrade to optimal comfort with our pressure relief cushion (18"L x 16"W x 4"H) and transform your sitting experience today. Note: For optimal comfort, we recommend this seat cushion for individuals weighing less than 200 pounds. For weights exceeding 200 lbs we recommend the upgraded version SC Butterfly XL
  • Pressure Relief Seat Cushion: Split design targets pressure points on hips, thighs, coccyx for relief from lower back, hip discomfort, promoting proper posture. Ideal for long hours seated, offers relief from back and hip
  • Thick Cushion Pad: 4.3" thick memory foam remains firm and supportive without going flat. The extra-dense bamboo charcoal-infused memory foam for freshness. Provides all-day sitting comfort
  • Ease Of Use: Built-in handle to make it easy to carry. Breathable cover with zipper closure for easy machine washing. Non-slip bottom ensures grip, especially on leather seats, for secure placement. Removable cover maintains freshness, while the non-slip feature enhances stability
  • Take Comfort Anywhere: ProtoArc seat cushion relieves lower back and hip discomfort, perfect for road trips, exercise, gaming. Standard size fits all body shapes, suitable for car seats, office chairs, wheelchairs, ensuring superior support and comfort anytime, anywhere
  • Tips: 1. It may take 1-2 weeks to adjust to the cushion's shape for the first time. Many find relief from back and hip pressure while improving posture. 2.The cushion comes vacuum sealed so you will need to let it expand for an hour or two before first use
$24.99
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Product details

Fill MaterialMemory Foam, Recommended Body Weight < 200 lbs
Pillow TypeFurniture Cushion
ColorBlack
SizeLarge
BrandProtoArc

Technical specifications

fill_materialMemory Foam, Recommended Body Weight < 200 lbs
pillow_typeFurniture Cushion
colorBlack
sizeLarge
brandProtoArc
shapeSemicircular
special_featureAdaptive Memory Foam, Anti-Slip, Concealed Zipper, Pressure Relief Design, Removable Cover
cover_materialCotton
patternPlain
number_of_items1
product_dimensions18"L x 16"W
product_care_instructionsDry Clean Only, Machine Wash
indooroutdoor_usageIndoor
recommended_uses_for_productDriving, Reading, Resting, Sitting, Studying, Traveling, Working
item_firmness_descriptionMedium
item_weight2.2 pounds
model_nameSC Butterfly
material_featureMemory Foam
unit_count1.0 Count
fabric_typePilling Resistant Cotton
item_thickness4.3 Inches
manufacturerProtoArc
item_model_numberSC Butterfly
best_sellers_rank#1,906 in Office Products ( See Top 100 in Office Products ) #18 in Back Cushions & Seat Cushions
date_first_availableSeptember 1, 2024

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Customer reviews

4.41,857 ratings

Customers say

Customers find the seat cushion comfortable and effective, reporting zero pain when sitting and relief from back pain and fatigue.

★★★★★

great for heavy people.

PyratioDecember 21, 2025

pretty darn good cushion if you're a remote worker. Does not pancake under my 235 pounds and is very supportive. Have tested for nearly a month working 8+ hours a day and it is very comfortable. little tip, this will raise the height of your chair, so lower it slightly and you will be very comfortable. I had a great memory foam brand name chair but after 3 years that memory foam isn't as supportive as it used to be. this cushion will give you some back relief until another sale comes around for new chairs. Also it does position your a little forward, which I like a lot as that is how I sit most days. Read more

★★★★★

Must have for gamers!!!

Cody TJanuary 2, 2026

Makes my gaming chair SO comfortable!!! I could even put it at the dining room table or in my truck or on the floor if I had to. Haha. I haven’t washed it yet because I haven’t farted on it. It’s very soft but not so much that it flattens. Makes my back even feel better than that stupid chair alone. Read more

★★★★☆

Great product, more of a firmer memoryfoam

erin malerbaSeptember 19, 2025

Overall good quality product. More of a firmer memoryfoam. Good shape and size. Kind of felt like an adult booster seat as it has a good thickness to it, but not too much boost for a van seat, unless you're taller. It is a bit too firm for me personally as I enjoy more of a squish. This seat was comfortable, but the other one was the perfect squish for me. So I will be returning this item. But it is a good product and very supportive. Service Bonus Point - I bought this product today at 10am, as well as another cushion, for a very sudden and unexpected 10hr trip (with minimal stops) that I was made aware of with less than a days notice. They both arrived by 8am. This was a major convenience and saved me from debilitating back pains from sitting for over 3 hours. Read more

★★★★★

Great cushion!

Tracie HJanuary 2, 2026

The media could not be loaded. Let me start by saying that I paid full price for this item and was not given it in exchange for a 5 star review. This cushion earned the 5 stars all on its own! Honestly I was expecting much since I paid less than $20 but I have multiple medical issues that necessitate using some type of coccyx cushion when sitting on anything (chairs, wheelchairs, even fabric covered benches and ottomans) and I already own about 8 different kinds of cushions. I’ve tried (and still use the good ones) and many are pretty much identical to each other even though they boast different features and the listings look different. All of them are more expensive than this one (some significantly more expensive!). Recently I had to start weekly IV infusions and while they try to make the chemotherapy chairs as comfortable as possible any pressure on my tailbone and lower back is excruciating. Both sides of my pelvis are also fractured so I can’t lay one my side. This cushion is just the right height and density to take the pressure of of my coccyx (and lumbar/sacral area) while also having enough padding on each side for hips. It is wider than most of the cushions I own so if you have a particular chair or wheelchair in mine make sure you measure first. It also might not be ideal for very petite people. I’m about 5’7” 160 lbs but my great aunt who is 4’11” and 90 lbs soaking wet would be way too small to comfortably sit on this cushion. I can’t speak to whether it improves your posture why sitting because I have so many medical conditions that cause spinsl curvature that a cushion can provide support but definitely not alter my posture. I also can’t speak to the longevity of the product but it is very well made. The stitching is impeccable, the fabric is high quality, the material is sift, the zipper slides easily, and the handle is firmly attached. It’s honestly better quality than the $60-$80 cushions I’ve bought. It came nicely packaged with information about the company, the company’s founder, and customer service information in case you have any questions or issues. It has a 2 year warranty. I love that it has a removable cover that can be washed and even the inner foam material is covered in a waterproof material so you don’t have to worry about spills or accidents seeping in to the foam. Read more

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★★★★★

Comfortable lumbar support!

T WmsJanuary 9, 2026

This lumbar support seat cushion is so comfortable and it does its job! It also pairs well with my Veitail Lumbar Support Pillow, making sitting at work extra comfortable and I can feel the difference because my back pain has decreased. Read more

★★★★★

Great seat cushion

Karen V.December 31, 2025

Great product. I bruised my tailbone and ordered this. Kept it after I healed because it's so much more comfortable than my padded chair cushion. Read more

★★★☆☆

Good cushion for the tushion, just needs to fit the chair better.

KGPJune 30, 2025

I purchased a stupid expensive mesh chair that had the most uncomfortable seat. The manufacturer of said chair just refunded it & told me to keep it, and so my search for a comfy bum cushion was underway. I spent a couple hours researching and reading and decided upon this booty pillow. Upon arrival it's always fun for me to open the packages and watch these things spring to life. It has some pros and cons so let's begin. Pro- it's comfortable. I WFH 3 days a week, 8 hours a day so that's the .most important function. My Sciatica has not flared up since putting this glutaneous marshmallow to work. Some cons- it's tall, I mean really tall so I have to adjust my chair a little weirdly so it fits right. You have to hop in like a small child hopping into a booster seat at a restaurant. Its not very large around so it doesn't cover the chair seat so you have to do a wiggle dance to find the sweet spot. Once you find it, you don't want to get back up to pee or anything because the hop and wiggle dance will have to begin again. Overall, it does it's job, I'm not limping around with Sciatic issues anymore, I just wish it fit into the office chair seat like a standard tushion cushion, not a booty booster. Take this as you will. I think it's a love hate to be frank. Thus the 3 stars. Read more

★★★★★

Excellent Quality

Rob ZDecember 8, 2025

So, I'm an expat living in Africa. To get there from Houston, it takes two plane rides - one 16hrs in the air, another for 6hrs. Before I got this, I was miserable and in pain (airplane seats are now so cheaply designed and made), even with frequently getting up to stretch my legs. This pad is contoured perfectly, thick, and has a cut-out - or a tail-bone saver. This is a must have if you sit for long periods or travel long distances. Good purchase. Read more

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