There are a few different types of cushions that can be helpful for people with piriformis syndrome. A donut-shaped cushion can help take pressure off of the sciatic nerve, and a wedge cushion can help prop up the legs and hips to reduce strain on the lower back. Other options include an inflatable lumbar support cushion or a memory foam pillow. Ultimately, it is important to experiment with different types of cushions to find what works best for you.