I took my EZ Sport seat base to an upholstery shop, and asked them to put on much firmer foam. They put on two layers of firm foam, with a layer of jute in between, and a layer of thinsulate on top. The thinsulate is closed cell and doesn't absorb sweat. It is soooo comfortable. They knew what I was looking for better than I did. Cost; $50.00 Comfort; Priceless. bk