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

Color	gray
Size	15Lx12Wx4.7H
Manufacturer	ComfiLife
Material	Memory Foam
Item Weight	1 Pounds
Care Instructions	Machine Wash
Is Mildew Resistant	BPA Free
Fill Material	Memory Foam
Product Dimensions	38.1 x 31.75 x 11.94 cm; 453.59 g
Package Weight	0.68 Kilograms
Batteries Required	No
Batteries Included	No

(コンフィライフ) ComfiLife 腰椎サポートバックピロー オフィスチェアや自動車の座席用クッション メモリフォーム 調整可能なストラップ付 通気性に3Dメッシュ

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(コンフィライフ) ComfiLife 腰椎サポートバックピローオフィスチェアや自動車の座席用クッションメモリフォーム調整可能なストラップ付通気性に3Dメッシュ