# ProtoArc SC Butterfly Ergonomic Memory Foam Seat Cushion

Ergonomic: The ProtoArc SC Butterfly is a memory foam seat cushion with a U-shaped cut-out intended to reduce concentrated pressure during sitting. A carry handle and removable cover make it easier to move and maintain, but the listing gives inconsistent thickness and size details that are worth checking before purchase.

- [Original product page](https://bargainpostbox.co.uk/product/protoarc-sc-butterfly-memory-foam-seat-cushion)
- [View offer](https://bargainpostbox.co.uk/visit/protoarc-sc-butterfly-memory-foam-seat-cushion)
- Market: UK
- Language: en-GB
- Currency: GBP
- Brand: ProtoArc
- Model: SC Butterfly
- Category: Home & Kitchen > Home Textiles > Pillows, Cushions & Inserts
- Price: 22.79 GBP
- Previous price: 29.99 GBP
- Discount: 24%
- Price checked: 2026-11-14T10:11:29.718Z
- Rating: 4.3 / 5
- Reviews: 2577

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## At a glance

- U-shaped cut-out and split cushion design are claimed to distribute pressure across the hips and thighs.
- Memory foam is described as pre-shaped, medium firmness and infused with bamboo charcoal.
- Removable zip cover, non-slip base and built-in carry handle are listed.
- The listing recommends the cushion for people weighing less than 200 pounds.

## Pros

- The U-shaped opening and split design offer a targeted alternative to a flat seat pad for buyers seeking coccyx-area support.
- A handle and removable cover add practical portability and cleaning convenience, according to the listing.
- Customer feedback reports comfort and support during longer sitting sessions.

## Cons

- Customer feedback includes reports of the cushion shifting, feeling too small, or flattening over time.

## Specifications

### Identity
- Brand: ProtoArc
- Model: SC Butterfly
- Type: Furniture Cushion
- Size: L
- Colour: Dark Gray
### Dimensions and installation
- Dimensions: 45.7L x 40.6W centimetres
- Weight listed: 1.09 Kilograms
- Thickness listed: 4.3 Inches
- Shape: Semicircular
### Materials and care
- Material listed: Wool Cloth
- Fill: Memory Foam, ideal for < 200 lbs
- Care instructions: Dry Clean Only, Machine Wash
### Use
- Firmness: Medium
- Recommended uses: Driving, Reading, Resting, Sitting, Studying, Traveling, Working
- Indoor or outdoor: Indoor

## Before you buy

- The listing says the vacuum-sealed cushion needs one or two hours to expand and that adjusting to its shape may take one to two weeks.
- Listing details are inconsistent: one feature gives an 18"L x 16"W x 4"H size and 4.0" thickness, while the technical details list 45.7L x 40.6W centimetres and 4.3 Inches. The cover is described as both wool and machine-washable, while care details also say dry clean only. Confirm the selected listing’s dimensions, thickness and cover-care instructions. The weight guidance says less than 200 lbs and recommends the SC Butterfly XL above 100kg, so check suitability if near or over those limits.

## A good fit for

- People wanting a portable seat cushion for an office chair, car seat or other listed sitting uses.
- Buyers looking for a U-shaped memory foam cushion and removable cover.

## Less suited to

- People who need confirmed dimensions or a clearly specified cleaning method without checking the listing first.
- Buyers above the stated weight guidance who do not want to consider the recommended XL version.

## Customer feedback

Customer feedback highlights comfort, cushioning and perceived pressure relief during longer sitting, with customers also describing the support as helpful. This aligns with the listed memory foam and U-shaped cut-out, but it does not establish a particular medical outcome. Experiences with grip and size vary, and some feedback reports that the foam may flatten over time. Those concerns matter if you need a consistently fixed fit or long-term firmness.
- Positive themes: Customers report comfortable cushioning and support for longer sitting.
- Positive themes: Customer feedback describes perceived pressure relief and appreciates the U-shaped support.
- Mixed feedback: Feedback is mixed on grip, with some customers saying it stays in place and others reporting movement.
- Mixed feedback: Customers differ on size, and some report that the foam flattens over time.

## Frequently asked questions

### What shape is the ProtoArc SC Butterfly cushion?
The listing describes a U-shaped cut-out and a semicircular item shape. It says the design is intended to help distribute pressure.
### What are its dimensions and thickness?
The details list 45.7L x 40.6W centimetres and 4.3 Inches thick. A feature description instead gives 18"L x 16"W x 4"H and 4.0" thickness, so confirm the selected listing before buying.
### Can the cover be machine-washed?
The feature text says the removable zip cover is machine-washable, but the care details say both dry clean only and machine wash. Check the care instructions for the selected item.
### How long should it expand before use?
The listing says to allow one or two hours for the vacuum-sealed cushion to expand. It also notes that adjusting to the cushion’s shape may take one to two weeks.

## Alternative options

- [5 STARS UNITED Seat Cushion - Memory Foam Chair Cushion for Tailbone Pain Relief - Ergonomic Support for Coccyx, Sciatica & Butt - Office, Desk & Gaming Chair, Car Seat, Wheelchair, Black Suede](https://bargainpostbox.co.uk/visit/protoarc-sc-butterfly-memory-foam-seat-cushion)
- [POOTACK Seat Cushions, Comfort Memory Foam Office Chair Cushion \| Supportive Desk Chair Cushions Seat Pad for Office Chair/Car Seat/Gaming Chairs/Wheelchair, Large & Non-Slip](https://bargainpostbox.co.uk/visit/protoarc-sc-butterfly-memory-foam-seat-cushion)
- [Benazcap Memory Foam Coccyx Cushion to Reduce Tailbone Pressure, Black. \| Office Chair Cushion, Ergonomic Seat Cushions for Home, Office and Wheelchair, Car Seat Cushions for Driving, Non-Slip Base.](https://bargainpostbox.co.uk/visit/protoarc-sc-butterfly-memory-foam-seat-cushion)
- [Seat Cushions Extra Large Ergonomic Memory Foam Pad for Office & Car Chairs \| Orthopedic Ergonomic Office Chair Seat Cushion for Sciatica & Back Tailbone Pain Relief,Great Gift for Office Worker & Driver](https://bargainpostbox.co.uk/visit/protoarc-sc-butterfly-memory-foam-seat-cushion)
- [Senaire Office Chair Cushions, Comfortable Memory Foam Seat Cushion, Back Support Cushion Suitable for Car Seats, Office and Travel Backrests \(Black\)](https://bargainpostbox.co.uk/visit/protoarc-sc-butterfly-memory-foam-seat-cushion)
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- [X-Large Seat Cushions, Ergonomic Office Chair Cushion Premium Memory Foam Long Sitting Support With Centre Hole, Comfort Desk Chair Cushion for Office, Car, Home, Wheelchair & Gaming,Non-Slip,Black](https://bargainpostbox.co.uk/visit/protoarc-sc-butterfly-memory-foam-seat-cushion)
- [POOTACK Seat Cushions - Memory Foam Office Chair Cushion \| Supportive Design, Non-Slip Car Seat Cushion Pad for Long Sitting, Gaming, Travel and Home Use](https://bargainpostbox.co.uk/visit/protoarc-sc-butterfly-memory-foam-seat-cushion)
- [Vmingo Gel Seat Cushion, Thick Big Breathable Honeycomb Design Egg Gel Cushion,Double Thick seat Cushion, Ergonomic Support Pressure Cushion, for Car Office Home Wheelchair Chair](https://bargainpostbox.co.uk/visit/protoarc-sc-butterfly-memory-foam-seat-cushion)
- [Everlasting Comfort Car Seat Cushion for Driving - Wedge Car Cushion for Office, Travel, Gaming Chair Memory Foam Driver Booster for Short People, Non-Slip, Washable Cover, Back & Sciatica Relief](https://bargainpostbox.co.uk/visit/protoarc-sc-butterfly-memory-foam-seat-cushion)
- [QUTOOL Car Seat Cushion Car Wedge Booster Cushion Memory Foam Car Seat Pad Breathable Seat Cushion, Car Seat Cushions for Long Driving](https://bargainpostbox.co.uk/visit/protoarc-sc-butterfly-memory-foam-seat-cushion)
- [5 STARS UNITED Ergonomic Seat Cushion – Memory Foam Comfort for Tailbone, Hip & Coccyx Sitting Support – Office Chair, Car, Desk, Wheelchair & Gaming – Black](https://bargainpostbox.co.uk/visit/5-stars-united-large-memory-foam-ergonomic-seat-cushion)

## Add-ons

- [Everlasting Comfort Memory Foam Seat Cushion for Office Chair, Car & Home – Comfort Cushion with Washable Cover, Non-Slip Bas](https://bargainpostbox.co.uk/visit/protoarc-sc-butterfly-memory-foam-seat-cushion)
- [iamcomfi Coccyx Cushion for Tailbone Pain Relief – Medium Hardness - Memory Foam Sciatica Pillow for Back, Hip & Coccyx Pain](https://bargainpostbox.co.uk/visit/protoarc-sc-butterfly-memory-foam-seat-cushion)

## Images

![ProtoArc SC Butterfly Ergonomic Memory Foam Seat Cushion — 1](https://bargainpostbox.co.uk/i/eiZJGWP9LYjiP4HOWTXOwzyYggdVq2Hq280_qpYaFez6epqrrg8RS94dcA5N4gKtMNwtjyJcBd-abmsinkvAr4_SFQWdg2HeBlmceTwtMG-REju7xo_Jqoil.jpg)

![ProtoArc SC Butterfly Ergonomic Memory Foam Seat Cushion — 2](https://bargainpostbox.co.uk/i/fwnWmaeKUE0GpT9n8l5QU5_bNbw4JU6_8j_PtcocW6_fcP5S4v0uP5ysRK1KPEZkMZJtthsL43GzP88lNeu62wrIfJYf5QsYKzwPKpz8OffW6vzXUPy7ga9q.jpg)

![ProtoArc SC Butterfly Ergonomic Memory Foam Seat Cushion — 3](https://bargainpostbox.co.uk/i/PysygQkQUl1maVUml9vxyeq4I4c44aJr4Y04p-0KcKstEhC2Pzj9wyNYh25vzhgEuEhCWKwdtEHqFIQnBrGH8SXtwe5SxHcwz4Uow6PsUVVZthR6sDl_MHMO.jpg)

![ProtoArc SC Butterfly Ergonomic Memory Foam Seat Cushion — 4](https://bargainpostbox.co.uk/i/_tOOU3ihBh7gPsd7-7BOgZmbBRfl7B-lc0-jaxs6LK2V3MzfK6aR-MME6YIUQ1dov5-Bb9-HNkkLMOQQpSk5aJE5OvVD5DUztPrNbqejAlR1bAeRzoBUS1eG.jpg)

![ProtoArc SC Butterfly Ergonomic Memory Foam Seat Cushion — 5](https://bargainpostbox.co.uk/i/f-nZ7Pej2PZ6RcVq-BvdfGlE5vA5sa4bZfSmDUNvpw_k21swfYOgt8VKVpzyqIbU9fs4WdIg7dP_dMxlQ2zfUlgpF3iZlkFdiF2-EfNiU38FAH2_6rArgMZz.jpg)

![ProtoArc SC Butterfly Ergonomic Memory Foam Seat Cushion — 6](https://bargainpostbox.co.uk/i/zHN3w1wqP3YafNUo6wZVOCOvgPLGWJ5fmIbEm7xm0ok2AIQMmEp4tygWJJXdB9hVkA14TuWLgbOSFO2iHCDbyOID_7Qvwsu0wdtpLDqRmVVfGz6n05K84zTF.jpg)

![ProtoArc SC Butterfly Ergonomic Memory Foam Seat Cushion — 7](https://bargainpostbox.co.uk/i/ekCgw0F9gUGw0fBmEQ3OtGO94wKOa9dyinmtP5W-95LLTu8psQeN7NIFczB87jfxFI8vr-TWIfcMXDjeniX7Faq4U87l-NDG0mccsxueGjh-Ct6NJ74txzsq.jpg)