Has anyone used it in combination with the ComfiLife bottom seat cushion?

Yes, and I concur with Dympo. The combination of the two has made a world of difference.

is it too thick for the car

Yes, it is too thick for my Nissan Altima. I moved my seat back two inches, and the cushion still binds/slips towards the passenger seat when I slide into the driver's seat. Once seated. it felt like my stomach was being pushed out, rather than my back supported. Tried it in my wife's M-Class MB and it was even worse...if it was half as thick, it might work in a car

ASIN	B01ACH9FPG
Age Range Description	Adult
Best Sellers Rank	#214,215 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #517 in Back & Seat Cushions
Brand	ComfiLife
Coin Variety 1	Memory Foam,Lumbar Support,Seat Cushion
Colour	Grey
Customer Reviews	4.4 out of 5 stars 10,970 Reviews
Enclosure Material	Memory Foam
Fabric Type	Mesh
Fill Material	Memory Foam
Item Dimensions L x W	38.1L x 31.8W Centimeters
Item Firmness Description	Medium Firm
Item Weight	1 Pounds
Manufacturer	ComfiLife
Manufacturer Part Number	BD3860
Material Features	Breathable
Material Type Free	BPA Free
Model number	BD3860
Number of Pieces	1
Pattern	Solid
Product Care Instructions	Machine Wash
Recommended Uses For Product	Car
Shape	Wedge
Size	15Lx12Wx4.7H
Special Feature	Adjustable , Removable
Special Features	Adjustable,Removable
Target Use Body Part	Back
UPC	703510477972
Unit Count	1.0 Count

ComfiLife Lumbar Support Back Pillow Office Chair and Car Seat Cushion - Memory Foam with Adjustable Strap and Breathable 3D Mesh

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