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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🪑 Sit Smart, Work Better: Comfort that moves with you.

STAY PUT STABILITY - Non-slip rubber base ensures cushion stays perfectly in place on any seat.
ERGONOMIC TAILBONE RELIEF - U-shaped cutout reduces pressure for healthier posture and pain relief.
VERSATILE SEATING SOLUTION - Ideal for office chairs, cars, planes, and more—designed for professionals on the move.
PREMIUM MEMORY FOAM COMFORT - High-density foam cushions all-day sitting with soft yet supportive firmness.
EFFORTLESS PORTABILITY CARE - Built-in handle and machine-washable velour cover make it travel-ready and easy to clean.

The ComfiLifePremium 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, while the built-in handle and machine-washable velour cover offer portability and easy maintenance. Perfect for office chairs, car seats, and travel, it supports healthier posture and reduces discomfort from sciatica, herniated discs, and prolonged sitting.

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€ 77.16

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Slovakiastore

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Recommended Uses For Product	Office, Car
Shape	Semicircular
Color	Black
Pattern	Solid
Item Firmness Description	Soft
Special Features	Portable, Lightweight, Washable
Fill Material	Memory Foam
Material Type	Memory Foam
Product Care Instructions	Machine Wash
Fabric Type	Rubber,velour
Item Weight	1.3 Pounds
Item Dimensions L x W	17.5"L x 13.7"W

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)

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