It seems to be of good quality and has a nice design compared to other cheaper ones I have used. I have had it for a month and it is okay. The only thing I didn't like is that it slips a little on the chair I use it on.

This is a pillow made entirely of memory foam that, according to the company, supports up to 100 kilograms of weight. It saved me with the hollow in the middle. The difference is incredible. It's worth the money. Official page: https://www.orthia.eu/en/product/coxim-coccigeo/

The best thing, I had an issue with my back due to many hours of sitting work. As soon as I sat on it, the pain stopped and already from the 2nd day I am much better

It may be the most expensive on the market, but it is of excellent quality. Black color. Thickness greater than the others (even though I weigh 120 kilograms, I sit on it just fine).