I have the weaver contoured western all purpose saddle pad and I want to get a saddle pad liner to keep it protected. The saddle pad I have is 32'' x 32'' but can I have a 30'' x 30'' saddle pad liner or does it need to be the same size as my saddle pad? Also I am currently considering the professionals choice one which is 80% wool and 20% poly blend and then the cashel company one which is felt. Which one of those would be best or if not those which one would you suggest? What is the best material for a saddle pad liner? I also thought about getting a non slip one the dura-tech western non slip pad or a different one.