Best Use: All Conditions The PRO Merino 200 Henley is comfortably worn next-to-skin, or as a mid-layer in cool-to-cold weather. Designed for temperature regulation, odor control, and comfort, PRO Merino features a revolutionary layered structure with 17.5-micron Nuyarn Merino on the inside and hydrophobic eyelet polyester on the outside, woven together as one. The inside Merino layer quickly absorbs body vapor and sweat while the outer Polyester layer wicks it away from your skin. Moisture is distributed throughout the eyelet construction to speed up the drying process and encourages airflow within the fabric. This moisture management is a mechanical process and the result is a fabric that absorbs, disperses, and evaporates moisture four-times faster than pure Merino or comparable weighted blends. Developed in New Zealand, Nuyarn technology has revolutionized the Merino wool market.