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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ComfiLife Premium Comfort Seat Cushion - Non-Slip Orthopedic 100% Memory Foam Coccyx Cushion for Tailbone Pain - Cushion for Office Chair Car Seat - Back Pain & Sciatica Relief (Black)

Product ID: 251835846

Details

Brand
ComfiLife
Color
Black
Fill Material
Memory Foam
Shape
Semicircular
Special Feature
Lightweight

👜Built-in Handle for Portability

🧠100% High-Density Memory Foam

🛡️Non-Slip Rubber Bottom

509.19 DT

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Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🪑 Sit Smart, Feel Elite — Comfort That Works as Hard as You Do!

ON THE GO EASE - Lightweight with a built-in handle—comfort wherever your busy life takes you.
STAY PUT DESIGN - Non-slip rubber base ensures cushion stays perfectly in place all day.
ALL IN ONE COMFORT - Premium memory foam cushions sciatica, back pain, and pregnancy discomfort.
EFFORTLESS MAINTENANCE - Machine-washable velour cover keeps your cushion fresh and professional.
ERGONOMIC TAILBONE RELIEF - U-shaped cutout reduces pressure for healthier posture and pain relief.

The ComfiLife Premium Comfort Seat Cushion features 100% high-density memory foam with a U-shaped ergonomic design to relieve tailbone and lower back pain. Its non-slip rubber bottom keeps it securely in place on office chairs, car seats, and more. Lightweight and portable with a built-in handle, it’s perfect for professionals seeking all-day comfort and support. The machine-washable velour cover ensures easy upkeep, making it a must-have for anyone battling sciatica, back pain, or prolonged sitting discomfort.

Specifications

ASIN	B08HQRRVTH
Age Range Description	Adult
Best Sellers Rank	#5,229 in Automotive ( See Top 100 in Automotive ) #13 in Wheelchair & Mobility Scooter Cushions #28 in Automotive Seat Cushions #64 in Back Cushions & Seat Cushions
Brand Name	ComfiLife
Coin Variety 1	Memory Foam,Seat Cushion
Color	Black
Customer Reviews	4.4 4.4 out of 5 stars (23,116)
Fabric Type	Rubber,velour
Fill Material	Memory Foam
Global Trade Identification Number	00850023513021
Item Dimensions L x W	17.5"L x 13.7"W
Item Firmness Description	Soft
Item Weight	1.3 pounds
Manufacturer	ComfiLife
Manufacturer Part Number	CLSCBLK
Material Type	Memory Foam
Model Number	CLSCBLK
Number of Pieces	1
Pattern	Solid
Product Care Instructions	Machine Wash
Recommended Uses For Product	Office, Car
Shape	Semicircular
Special Features	Lightweight, Portable, Washable
Unit Count	1 Count

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