Whether you suffer from stiffness, sciatica, a weak back or have a sedentary office job, this pillow could help address those issues, per a gang of reviewers.

It seems too practical to be effective, but so many users say that by sitting on this cushion, you can effectively support the coccyx and relieve pressure off your back, hips, tailbone and more. For an office worker who sits at their desk 8 hours a day, “This cushion made all the difference in the world.”

One reviewer describes it as “wonderful” after softening the cushion somewhat to reduce its firmness: “I have sciatica pain and face a three-day travel coming up. I ordered this cushion, and it was hard and uncomfortable. I decided to step on it over and over, until it softened. Now it is wonderful. Sitting on it brings relief right away. I am 87 years old, and relief is necessary!”

Another reviewer calls this “a must for long flights,” saying that it makes uncomfortable coach seats more bearable.

The pillow is also great for long drives, as a shopper named Ryan says: “In my opinion, this product really shines on long car drives. I used to get back pain driving my Mustang GT coupe because of the hard seats, but using this seat completely changed that. My back pain went away almost instantly.”