The PrAna Continuum is a hard wearing climbing pant, with lots of climber-specific features. It has a diamond crotch, a bit of spandex woven into the cotton for extra flexibility and a neat cinch system at the bottom hem. The knees are articulated and the wast has a belt system built-in.
These robust pants move well with your body and will be well suited to climbing indoors or out. If you prefer something a little more lightweight (and a little less robust) then you might want to take a look at the Ecliptic pant instead. If you want something durable and highly useable the Continuum is a great shout.
Organic cotton stretch canvas
Cinch system at bottom hem
Articulated knee darts
Rock Canyon print details on belt loops and pocketing