This started out to be a problem area for me when riding. I wear nylon shorts with mesh lining inside when I ride. Nice and light, big leg holes so they don't bind and they don't wind up in a crotch wad. There is no way you can wear normal boxer underwear when riding as a single try of them resulted in a quick turn around to the house a butt crack extraction and then return to riding. Free balling in the nylon shorts seemed to be the anwer. But as I started to ride longer and faster I had chafing issues. The further, faster and more often I rode, the more serious the issue. Baby powder or even better, plain old fashioned corn starch helped. Lotion did not. I replaced the factory seat that had a fairly wide "nose" and stitching in the middle of the sides (now I ride on a B-17) and that helped too. But still, total comfort and a chafe free riding experience eluded me. And then one bright shining day I was waiting for lovey at the park where we were going to get on the bike trail. A runner that was getting ready for his soiree and I started to talk and somehow the chafing subject came up. Lo and behold, he'd had similar problems too - but had found the answer - Under Armour boxer briefs. Lovey and I talked about that later as we rode, I wanted to try them out. So. That very night she stops at Target for a few things and shows up at the house with some Target brand boxer briefs that I assume are under armour knock-offs. I tried them the next day. GOD BLESS THAT RUNNER! Finally, a totally comfortable and 100% chafe free riding experience was mine. I went back to Target and bought every pair they had. They are made of Modal fabric. Modal is a natural synthetic (oxymoron?) made from beech trees. It's a silky feeling high wicking fabric and has some spandex and a minimal amount of nylon. Very comfortable, good support and they don't ride up and wind up in a crotch wad and they do protect that formerly chafed area perfectly. I like this underwear so much I haven't gone the real Under Armour route yet to see if that stuff is even better. But the boys both have Under Armour shirts and LJ's and they really like them, so maybe I'll still have to give it a try. Anybody else have any good underwear secrets?