David R.wrote a review of Arc'teryx Captive Polo Short-Sleeve - Men's on May 13, 2012
I own 2 or 3 of these polos, and think they're wonderful products.
I'm 6'4" and fairly trim, and have a hard time finding shirts that fit my frame. I'm also a rock climber. These Arcteryx polos are marketed as having harness length hips and gusseted underarms, so I've found that that makes them a de-facto "tall" size without being billowy or baggy like most shirts I'd buy at the mall.
I've also worn them sport climbing and indoor gym climbing sessions and found them to be fairly high functioning, even when I'm moving around a lot.