Terramar Thermawool Merino Wool Pants 95% Polyester/5% Spandex Imported Climasense thermoregulation technology keeps you comfortable in all conditions: fast wicking and drying Midweight warmth (3.0) and superior breathability Brushed microfiber against the skin for no itch UPF Rating 50+ Engineered to adjust to your body temperature; inhibits the growth of bacteria that causes odor