Sometimes adaptation means being in the right place at the right time. Sometimes it means getting off the couch and getting outside. The Arc'teryx Men's Phasic Evolution Crew Shirt knows what's up, because it actively adapts to your energy output, stretching when you move and wicking away excess body heat when you're hiking. It's light enough for a summer backpacking expedition, and treated with an anti-odor finish to ward of odor so you don't find yourself hunting for a laundromat instead of the next trailhead.