What material do all you endurance pros prefer your girths to be made of? I have always used the classic hunter style leather girth with the elastic end, but I am wondering if a mohair, neoprene, or fleece lined girth would be more comfortable for my mare as we start doing longer distances. She completed her first 15 mile ride, has always shown in, and currently has been training in, her leather girth with no issues but we are hoping to move up to a 25 mile ride in about 6 weeks and I'd like to be prepared. Also, we are in southern Michigan, so heat and humidity may be a factor as well. Any advice on what you use and why will be much appreciated!