In 2011 I posted
"I wanted to report back my seat issues for others with the same problem. I've been sitting on an orthopedic wedge cushion, and for a couple of months have been using an Obus Forme backrest. The backrest comes with a separate lumbar support, so I'm actually using three cushions. I've had good results. I think it helps quite a bit that I've anchored all 3 cushions with moderate-strength velcro tape, so nothing goes sliding around. I'm much more comfortable now driving the car and feel like I can keep it indefinitely now without worrying about back issues."
6 years later, still sitting comfortably.
H Brown

Regarding seat cushions
 

Hi, i know this is years later but I've been reading these posts seems a got a 2014 mazda 3 touring 3 wks ago secondhand for quite cheap, now i know why, they didn't mention the seats..
wow i am having lower back pain like I've never had before constantly and pain and numbness is shooting down my bottom and legs as well. I've seen my chiropractor to help but i still can't get comfy no matter what cusions and stuff i buy. O can't sell the car and have been everywhere to even change seats with no luck, even an upholster.. i cant afford to keep buying random cushions and back support so i was wondering if you could take a photo of the set up you have in your car so i could buy the same and try. Im in Australia so im not sure ig the product is identical here. The orbus back rest looks too wide for those seats and theres so manu different orthopaedic wedge cusions around too. I would be so grateful for any help as i literally can't drive the car til i sought this out. Also did you happen to find anything else? Thank you🙂

Reply to mazda3 seats
 

awesome, thanks so much, appreciate that. I didn't think the obusforme back cushion would fit, thought it would be way to wide.
i have a similar wedge cushion but they are both way to soft. Will just have to keep searching til i find a firmer one. Cheers again🙂