Agreed- 34" would be WAY too long for your mare. It's actually better to go smaller; as the pic shows, it doesn't put pressure in a sensitive area, and it will keep the saddle more securely in place. I also prefer the roper style, as it spreads the pressure out, and a plain string cinch, "roper" style is the only kind of cinch I use now. It "breathes" too and is more comfortable for the horse, as it has openings. I also tried the Neoprene and HATED it, especially in summer. They really make a horse sweat, and it has to be uncomfortable. I've known people who use merino wool as well as fleece, and honestly, they are a lot more expensive than the plain, simple string cinches that have been used at least since I was a little girl--50 years. They are also super easy to clean. Just rinse after you ride and hang up to dry! Why pay a lot of money when these cinches are time-proven?