Four-way stretch PolartecÆ Power WoolÆ Balaclava. The ultimate piece for cold weather. Comfortable under hoods and helmets or as a stand alone piece. Power WoolÆ is a design breakthrough for combining the distinct advantages of natural and synthetic fibers in a bi-component fabric. Merino wool interior against the skin, and a synthetic fiber exterior optimizing wicking, breathability, odor resistance and durability.