The Clima-Wool fabric features our comfortable and durable merino wool, nylon, and spandex blend. Perfect for hiking and winter wear anywhere. This fabric is designed to provide superior performance and comfort during any season. Clima-Wool base layers offer exceptional breathability and temperature control for maximum comfort regardless of the situation. The Women's Merino bottom midweight is fast-drying and moisture-wicking, keeping you dry and refreshed regardless of activity.