I've owned several pairs of these jeans through many washings and still love them.  They're tight, but not skin-tight.  For the record, the Boy's size 20 measures 30" X 30.5" (Hey Levi! How about a chart!) and differ from the adult cut only in the cuff opening which is 1/5" larger in Boy's.  The touch of spandex makes for a flexible fabric that gives you the range of motion you need if your active.  The best part is not having mounds of material swishing and rubbing against each leg when you walk.

The 9" rise on these jeans means they sit on your hips like normal jeans.  They don't feel like they're about to fall off, and you've actually got usable pockets!  It's a comfortable fit that's cut right for a slim guy.  They're as fine a pair of skinny jeans as you'll find.