We chose mohair and I would do so again, I just think it looks smarter. In a previous post I reported on the use of Raggtopp Cleaner and Raggtopp Protectant that is recommended by the manufacturers of the material.
http://www.talkmorgan.com/ubbthreads.php/ubb/showflat/Number/145820Our top is 100% waterproof even in the heaviest rain. The material is a sandwich of woven acrylic cloth and a waterproof membrane.