Hey Luv, I don't have the Shebeest knicker that they sell here on TE (I think it's the Pedal Pusher), but I do own a pair of the shorts with the same chamois. I think it would be substantial enough for a century. If you can find any Shebeest bottoms with the SheLastic Chamois, that's the same one that's in the Pedal Pusher. Love that chamois.