Just got these. They're the ones with the elastic chamois. I wore a pair on my ride today, and I now know what it must be like to have the alien attach itself to your face...only...not the face. Don't get me wrong, they are not unpleasant; in fact, they are extremely comfortable. The chamois did not move at all on my ride. It kind of attached itself and stayed put. Today's ride was only 12 miles, but I would expect them to be just as comfortable on a longer ride.