You sir, are a wizard and I salute you. Now, a classic "from the comments" moment here... how about a followup video. Leave a couple of those foams (we all know you will be getting more haha) in a hot car all day in that sweltering California sun and see if that works. All in the name of science!
Oh, a hair dryer or some time in the sun works just as well-- but when you've got a pile of a dozen of 'em on the bench, the heat gun takes care of it in a few minutes.
The brand is called "Timtin" and they're as close as you can get to ProLine without spending Proline. I'm running them in several rigs at this point. The inners are REALLY firm, but they sure seem to work. I know there are some others that have a rubber inner instead of closed cell, and those feel hard as rocks.
But the foam didn't expand 😂. I love these foams. I left my sit out overnight and they expanded to original size. But they are a mess when you receive them lol