Aftermarket seat cushion?

I use THIS ONE
available here cheaper

You mentioned long haul truck drivers in your post, so I will tell you what I used with great success for long periods of sitting.

As a OTR driver for 40 years, I have tried almost everything to ease that sore butt syndrome.

I worked for an aerospace company and we were always guinea pigs for a lot of stuff. Some worked and some not so much.

One day an engineer from the Space Program came along and said that he had a solution to fatigue and that sore butt syndrome we all had from long hours of sitting in the cab of a truck,and that they were using it for their Astronauts and Pilots with great success and he wanted to test it out on us.....OH WHOOPEE.

Ya ready for this??
Sheep Skin seat covers......

As a full seat cover they were great but a little warm at times. So in the summer I just used the bottom half. I never went on another trip after that without one. I have logged a few million miles and this is the best seat cushion material I have ever used. You will see A lot of people that are confined to wheel chairs use them.

That is my story and I am sticking to it.........:B

An awful lot of professional pilots use sheepskin covers on thier AC seats!
I used to do some work on corp. jets and saw them all the time.

My touring bicycle also had sheep skin over an Italian leather seat.

I've had a few as a trucker. The latest (love this name) is the Wondergel Supercushion. Bought at T/A truckstop. Tall, thick, it cuts the vibrations almost completely. Makes one aware of what is transmitted through feet and hands as they are now isolated. I run about 3k miles/wk and often on long stretches of unpaved lease roads out near Mexican border to drilling rigs. That, or very long days on Interstate gives a good cushion cushion the proper test.

Oregon Aero is a company with a product to investigate (posture more than cushioning) and another wheelchair product is ROHO.

Good luck

Thanks, everyone. I'm disappointed in myself... as a retired Army nurse, I should have thought of sheepskins... those and the early gel pads were the go-to items for patients with mobility issues. I'm glad Slowmover is happy with the Wondergel pad, but reading reviews on Amazon, many users are initially pleased but become dissatisfied and discard them after a couple of months. The tough job now is to talk my wife into springing for sheepskins (probably bottom seat pads or the panel inserts rather than $299 each for full seat covers, though).

I've had that wondergel EXTREME SEAT CUSHION for more than four months and 53,000+ miles of use as a truck driver in hot as hell Texas working the oilfield. It's like new. I'm 6'2" and 200#. I should have stated more clearly that mine is 2" thick. About $80 at T/A truckstop or $55 online. Whether or not the OP wants one this thing is tough and works. I've thrown out plenty of others.

I'd like sheepskins as well, but not in the company work truck.

I have a ROHO AirHawk truckers seat cushion that I use all the time. itis wonderful. You can have the air constantly moving to alleviate sore spots or you can lock the air either in the front or move it to the rear of the cushion as you want.
My boss tried three or 4 different seat cushion's of various designs before trying mine and falling in love with the ROHO Airhawk too.
ROHO Airhawk Pro-standard

I'd get this. Every truck driver in Delhi has one. A half a billion Indians can't be wrong. :B