Anyone here double-up on your Stearns seat pads? I currently have one on my bike, and it's fine with how I ride (never ride for more than an hour at a time), but I plan to do some longer rides this summer as I would like to do more camping. Anyhow, even though my butt likes the pad, I wonder if 200 to 300 miles on one pad would be a problem. The local WalMart had the Stearns pads on the clearance rack for $15 (not too much of a clearance price) since nobody in my area rides ATVs or anything, so I picked up another one in case I wear mine out. I was thinking about it, and thought adding a second one wouldn't hurt. I just wonder if the second one would slide much on the first one. Anyone here ride with two of them?