I don't like riding on a Brooks with the Aardvark rain cover (got the Aardvark because I heard of fit complaints with the Brooks cover) because it slides around and then my arse slides around, but I usually don't ride long in the rain so I can stand it, I use it more to cover the saddle when I camping at night in case it rains. I found too that these covers don't last long, I'm on my second one, but they're cheap.