I've used a Tush Cush for years, to help position my scoliosis-affected back and pelvis most optimally. The other day, in my car, as I adjusted my 13" x 18" cushion so I could more easily attach my seat belt, I wondered if Tush Cush makes a slightly narrower cushion. Duh! How I wish I had checked that out earlier. This 16" wide cushion is beyond perfect. No more scooching around to snap that seat belt. And not just the size. The sheepskin covering is comfortable, neither too hot nor too cool. The foam feels like the ideal firmness. My back has not ached in the car, 'cause I'm tipped just right now. Gratitude flowing to all the Tush Cush people!