The thickness, the gel-like feel, the honeycomb texture that adjusts as you move.
Have not discovered any but we did remove the outer cover because the attached carry strap caused skin irritation to clients back (even through his pajamas). It was positioned towards the back of the chair while he was sitting, but his motion in the chair must have caused it to become exposed. He prefers the cushion without the cover anyway.
carol h. from washington, nc (caregiver)
My brother-in-law is in a chair most of the time. This cushion relieves the pressure of sitting and is just what he'd been hoping to find. It works!