I wear around a 32-33 waist and the Large fits perfect but even if I lost a few pounds, they would still fit. There is lots of elastic in the waist and if that isn't enough, there is also a belt. When I wear the liner, they fit snug but not tight, without the liner they still fit, but much looser.
That click in liner is just so smart and those two map pockets are awesome. I put hand towels and my beenie in them while riding and totally forget I have anything in my pocket.
Probably the best looking and most functional mountain bike shorts that I own.