What Our Gearhead(R) Experts Are Saying:"I packed the A/C Shirt for a trip to New Orleans, and it was the shirt I kept reaching for - the organic cotton is crinkly and ultralight in a way that just breathes, and the side vents keep air moving even when there's no breeze. It's relaxed enough to wear all day without thinking about it."When the temperature and humidity climb together, what you're wearing matters. Patagonia's A/C Short-Sleeve Shirt answers with an ultralight organic cotton construction that breathes freely and wicks moisture without weighing the day down. Side vents at the hem add extra airflow exactly where it counts, and wood-like buttons keep the look easy and unpretentious. At 5. 7 ounces, it packs down to almost nothing for travel and pulls out wrinkle-free and ready to wear. Whether it's a beach day, a warm-weather town wander, or a long afternoon in the sun, the A/C Shirt earns its name.