Ditto on the underwear. We used spandex type stuff under our old nylon lined Goldwing leathers (made for skiing and hiking under the outdoor stuff) and what a difference in hot weather. That in combination with a gel pad and you should be good to go. Anybody seen those Wally pads online at Walmart? Nearest Wally-world to me is a two hour drive, but for $20 I'd give one a go.