[Johnny5]

I put on 2000 miles last year, riding pretty much everyday of the summer/fall and every freaking day, my bum was numb after 30 minutes. When I first modded the stock seat and took it apart, it's clear why a lot of people get numb butt. There's a section of the base plate that's at the wrong angle for your bottom. After the stock foam warms up and squishes down, your butt hot spots are digging right into this angle and voila. Numbness.

If you notice the bottom of the Mustang seats, the seat pans are flat where your butt hot spots are. And the foam is a little stiffer.

If you dont get numb butt from the stock seat, you are very lucky and gifted.