Do you need an additional back support for road trip travel with this? Another piece to go against the seat?

I found that this was good enough, especially if you keep a little space between the backrest of chair and cushion. It kind of nestles you in. Also, if you use this AND a back support, there might be too many items on the seat, thus affecting your actual seating room. If you have back problems, Id just go with a back support and no seat cushion. 2cents.

Is this suitable for larger people or does it flatten out?

I am 190 lbs, weight has been fairly constant. My career choice finds me sitting in a chair in front of computer screens for very long days (40-60 hours per week) year round. I purchased this cushion in March of 2019. It is now January 2022. Thinking I might get a new cushion. The front of the cushion is now flattened to 1 1/2 inches from seam to seam in center of each thigh segment. The back is still at 2" and does provide some support (measured when I got up from seat after sitting continuously for an hour). Overall, I feel the support is weakening and this cushion should be replaced. It's been just short of three years, which is beyond satisfactory for the cost and benefits provided.

Do you have any certificates for this cushion?

I did not receive any certificates

Can you tell me the dimensions of this; I'm looking for a cushion that will fit the bucket seat of my Chevy Cruz, so nothing more than 12" to 13" wide

Sure. I measured about 17 1/2 wide, 14 long. Looks like it would be too wide :(

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Coccyx Orthopedic Memory Foam Office Chair and Car Seat Cushion for Back Pain and Sciatica Relief (Gray) by ComfiLife

Product ID: 142777001

Details

Age Range (Description)
Adult
Brand
ComfiLife
Colour
as shown in
Fill Material
Memory Foam
Item Firmness Description
Soft
Material
Memory Foam

🚗Versatile for office & car

🧠Memory foam comfort

🛡️Durable & long-lasting

187482CFA

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🪑 Elevate your seat game—comfort that means business!

NON SLIP BASE - Keeps the cushion firmly in place whether at your desk or on the go.
PREMIUM MEMORY FOAM - Soft yet supportive cushioning that adapts to your body for all-day comfort.
LIGHTWEIGHT PORTABLE - At just 590g, effortlessly move it between your office chair and car seat.
MACHINE WASHABLE COVER - Easy to clean and maintain, ensuring fresh comfort every day.
ERGONOMIC COCCYX RELIEF - Designed to alleviate back pain and sciatica with precision memory foam support.

The ComfiLife Coccyx Orthopedic Memory Foam Cushion offers targeted relief for back pain and sciatica with its soft, durable memory foam design. Featuring a non-slip base and machine-washable cover, this lightweight cushion is perfect for both office chairs and car seats, combining ergonomic support with everyday convenience.

Specifications

ASIN	B010TLSFA6
Age Range Description	Adult
Best Sellers Rank	#1,050,218 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #2,276 in Back & Seat Cushions
Brand	ComfiLife
Coin Variety 1	Memory Foam,Seat Cushion
Colour	as shown in the image
Customer Reviews	4.4 4.4 out of 5 stars (18,667)
Enclosure Material	Memory Foam
Fill Material	Memory Foam
Item Firmness Description	Soft
Item Type Name	seat cushion
Item Weight	590 g
Manufacturer Part Number	B010TLSFA6
Material Features	Non Slip
Model number	SYNCHKG080643
Number of Pieces	1
Pattern	Solid
Product Care Instructions	Machine Wash
Recommended Uses For Product	Car
Shape	Wedge
Special Features	Durable
Target Use Body Part	Back
UPC	703510477934
Unit Count	1.0 Count

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