Functional and versatile zip neck cut from Polartec® Power Air™ fabric, which is incredibly soft and comfortable. Ideal as mid or base - layer and suitable for high-performance sports, outdoor activities and during everyday activities. Polartec® Power Air™ is a new revolutionary knit construction that encapsulates air to retain warmth and reduce microfiber shedding. The result is a performance fabric with advanced thermal efficiency that sheds up to 5x less than other premium mid-layer fabrics. And while all fabrics will shed fibers over time, Polartec® Power Air™ is a step forward in reducing the environmental impact of what we make and wear.