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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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 (Gray)

Product ID: 16462195

Details

Brand
ComfiLife
Color
Gray
Fill Material
Memory Foam
Size
Special Feature
Lightweight

🧠100% Memory Foam for ergonomic support

🧼Machine washable velour cover

🛡️Non-slip rubber base for stability

$108.50

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Description

💺 Sit Smart, Feel Better — Your Back’s New Best Friend

NON SLIP STABILITY - Rubber base keeps cushion firmly in place during long sitting sessions
PREMIUM MEMORY FOAM - Soft yet supportive cushion adapts to your body for all-day relief
EASY CARE DURABILITY - Machine washable cover with lifetime warranty for lasting freshness
ERGONOMIC TAILBONE RELIEF - U-shaped cutout reduces pressure and promotes healthy posture
VERSATILE COMFORT ANYWHERE - Perfect for office chairs, car seats, and travel—comfort on the go

The ComfiLife Premium Comfort Seat Cushion features 100% memory foam with a U-shaped ergonomic design to alleviate tailbone and lower back pain. Its non-slip rubber base ensures stability on any seat, while the soft velour cover is machine washable for easy maintenance. Lightweight and portable, this cushion is ideal for office, car, and travel use, backed by a lifetime warranty to support your comfort journey.

Specifications

ASIN	B010TLSFA6
Age Range Description	Adult
Best Sellers Rank	#4,962 in Automotive ( See Top 100 in Automotive ) #14 in Wheelchair & Mobility Scooter Cushions #25 in Automotive Seat Cushions #62 in Back Cushions & Seat Cushions
Brand Name	ComfiLife
Coin Variety 1	Memory Foam,Seat Cushion
Color	Gray
Customer Reviews	4.4 4.4 out of 5 stars (23,153)
Fabric Type	Rubber,velour
Fill Material	Memory Foam
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	B010TLSFA6
Manufacturer Warranty Description	Lifetime Warranty
Material Type	Memory foam
Material Type Free	BPA Free
Model Number	SYNCHKG080643
Number of Pieces	1
Pattern	Solid
Product Care Instructions	Machine Wash
Recommended Uses For Product	Office, Car
Shape	Semicircular
Size	17.7Lx13.7Wx2.8H
Special Features	Lightweight, Portable, Washable
UPC	703510477934
Unit Count	1 Count

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$108.50

Duties & taxes included

In stock

Sold byAmazon British Virgin IslandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to British Virgin Islands.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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