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Under Armor --self wicking, get the ones with the short leg, these are the most comfortable underwear you can buy, at the end of a long hot day there is no discomfort.
UPDATE - riding shorts=undershorts, I don't ride with short pants either.
2 places come to mind: 1) Bicycle gear, 2) Horse riding gear. I'm assuming you want something underneath the jeans that has a little padding. Either one of those Google searches should bring something up.
As a previous, semi-serious cycle rider, (too old and decrepit now) you'll need monkey-butt powder if you wear something underneath as it will itch like hell.
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.
Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.
Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.
