If your saddle fits correctly, I suggest not using any form of half pad. Even if it’s thin, it’ll add more pressure which isn’t the best for an old horse. I hope this helps!
If your saddle fits correctly, then adding another pad will just change the fit of it and add more discomfort. Maybe investing in a Back On Track saddle pad or something similar would be more worth your while.
I would use a thick riser bad
This was the half pad I was thinking about getting https://www.horze.com/other-saddle-pads/horze-fur-half-pad/17606.html?color=G
My horse is around 20yrs old. I jump him anywhere from small x rails to 2'9". He is a bit old so I want to use a half pad.
I usually don't jump 2'9" usually only 2'~ 2'6.
My saddle fits him but he is old so I want some a half pad for more comfort and padding even when we're flatting. My saddle fits him so the only half pad that will fit him is something thin.