I put one of these AirHawk air cushions on my Africa Twin for my long-distance riding in Europe. So far, I’ve put 6,000 miles on mine this year and am quite happy. It has an air bladder inside that you blow up, then deflate to your comfort level. I let most of the air out of mine, and it is working well. Its mesh, so when its raining, it dries out fairly quickly. No more soggy bum!

Check out the AirHawk Motorcycle cushion here