I received my birthday present yesterday. Back on Track back warmer pad. In retrospect, I'm not sure it's supposed to be used as a saddle pad, because it has a wide velcro strip down the center. However, the velcro strip fits up under the saddle and doesn't impact his back. I rode him with it as the saddle pad and rump rug. I love the thickness and how warm it kept the muscles on his back.
It worked. Or at least it seemed to work. He was loose and relaxed and moved well, with propulsion. We rode for a good forty-five minutes and he was perfect. Not a single short stride.
We have another dressage lesson tonight, so we will see how he does.