Ergo21 is the best choice when it comes to seat cushions for sciatica. Crafted using micro stretch fabric, these cushions have multiple applications and can be used on a variety of seating options, such as cars, recliners, planes, trains, homes, offices, etc. The cushion features the advanced LiquiCell technology, which is designed to support your tailbone without putting pressure on the same. It has water-filled membranes that support your lower back and thigh muscles and distributes the pressure evenly. Sit for hours without any pain using the Ergo21 seat cushions. These are available in different sizes and varieties to suit your needs.