While I have an Aeron at home, I have a Mirra at work: http://www.hermanmiller.com/products/seating/performance-work-chairs/mirra-2-chairs.html http://www.herma

While I have an Aeron at home, I have a Mirra at work: http://www.hermanmiller.com/products/seating/performance-work-chairs/mirra-2-chairs.html http://www.hermanmiller.com/products/seating/performance-wor... The upper-end model has an adjustable "lip" that can take pressure off the undersides of the thighs. Look around for one to try out. I think it might fit your needs.