L'Occitane has a wonderful synthetic brush.
I'm also under the impression that their shave stuff is vegan.
Shaving & Skincare | L'OCCITANE en Provence | United States
Not too sure as I don't understand eliminating the use of naturally sustainable and biodegradable animal products in favor of non-biodegradable plastics. But that's neither here nor there. And L'Occitane packages mostly with Paper, Metal, and glass with minimal plastics so I'm on board. Plus their products perform quite well (at least the Cade shaving cream and ASB).