My personal favorite pair of warm weather riding pants are the Ugly Bros Motorpools. They have a lot of stretch to them, making them incredibly comfortable. They have well layed out pockets that are easily accessible on the bike. Accordion paneling on the knees and butt make it easy to stay seated for hours at a time on the bike, and the impact armor if easily removed from the outside, without having to take the pants off. Also they look damn good. They're not cheap, but I have been wearing mine for well over a year now and they've held up excellently.