The Sitka Merino Heavyweight Bottoms feature a premium 17.5-micron merino wool exterior paired with a soft polyester interior, creating a supremely insulating, breathable, and naturally odor-resistant base layer. These bottoms offer exceptional adaptability for layering in colder temperatures, ensuring comfort and performance when the temperature drops. Features: Premium 17.5-micron merino wool exteriorSoft polyester interior for added comfortExcellent insulation for cold weatherHighly breathable and stretchy designNaturally odor-resistant propertiesIdeal for versatile layering in varying temperatures. Sitka Gear Waterfowl Marsh Merino Core Heavyweight Bottom 10073-WL, 3XL