But I'm not convinced the RS3 needs them - the ride is firm but well within the realms of acceptability, and it's not like the car is wanting for extra stiffness when you're pressing on. (carthrottle.com)
Validated the temperature improvement of adding extra stiffness features. (jobhero.com)
Inflatable supports allow the driver and passenger to configure the seat to provide extra stiffness for the lower back area. (articles.orlandosentinel.com)