The VO saddles have what appears to be a fiberglass like reinforcing fabric on the underside of the leather. On mine, with probably about 1000miles on it, there are barely any dimples and it becomes uncomfortable to ride after about 25 miles or so. My Brooks saddles feel like sitting in butter by comparison. I have thought about trying to remove the reinforcing fabric from the VO saddle, but I suspect it's on there permanently.