For those who prefer natural fibers, the Classic Wool combines proven waterproof construction with a merino wool blend liner. You get wool&';s temperature regulation, moisture-wicking ability, and natural odor resistance in a completely waterproof package. The medium-weight construction provides warmth without excessive bulk, making it suitable for three-season use and moderate winter conditions. Merino naturally adapts to varying activity levels and temperatures. Warm when you need it, breathable when you&';re working hard.