Far be it from me to discern the composition of the seat but my owners manual says it is leather. If it is not we need to get a class action suit going against Triumph.OK.....It's definitive....vinyl. That means I won't be spending money on expensive leather products such a saddle soaps and conditioners. I'll stick with chemicals
such as Armorall and soap/water. Don't mean to start a discussion on vinyl cleaners ;-(