Patagonia Merino 2 Lightweight Pants - Women's 2012: The Patagonia Merino 2 Lightweight Pants warm up a predawn start like adrenaline firing you through the crux lead. Patagonia’s most versatile merino baselayer fabric, Merino 2, keeps you dry and comfortable during active pursuits in cool to cold conditions. It's naturally breathable, regulates body temperature, has a great warmth-to-weight ratio, stretches, is wonderfully soft, and naturally resists odor. All in all, it is the perfect baselayer for that 6 a.m. run that gets you going every morning.