I picked up a pair of these at REI. I wore them today along with elbow and knee pads. We had nasty ice conditions here, so I was well prepared. They are very comfortable over my biking shorts and under my wind pants.

Pro-Tec Hip Pads


-Spandex shorts feature strategically placed padding to protect against the bumps and bangs that come with riding

-Features anatomical stretch-fit construction in a flexible lightweight design so the shorts move with you without inhibiting performance

-Shorts are breathable, moisture wicking and machine washable

-Designed to be worn underneath your clothing