Hey Bill,
Get an Alaska Furs Sheepskin! Remember our trip to InZane 12. Not only adds padding, but keeps you MUCH cooler and Drier. Who wants Monkey Butt??
I recently put an Ultimate Big Boy on my IS. While I loved the backrest, the seat still left something to be desired. So, on went the Alaska Fur, and Voila`, MUCH better!

Last Sunday I put on close to 400 miles and it was a HUGE improvement! And its not even hot out yet!