The 2-inch-thick Purple Double is the most versatile cushion we tested, with a firm side and a soft side to accommodate different comfort preferences. It is supportive, breathes well, and fits on a variety of chairs.
According to physical therapist Dr. Akhil Chhatre, when you sit, all of the load of your upper body goes into the buttocks, which is what renders hours spent sitting on something like a wooden chair so uncomfortable. An ergonomic seat cushion may help to relieve some of that pressure by distributing the weight load across the cushion.
Seat cushions may be helpful for wheelchair users as well, but many wheelchair users work with their doctors and physical therapists to create specialized seat cushions. Keep in mind, too, that adding a seat cushion to your ergonomic setup can throw things off.