Polartec® Power Dry® Bi-Component Knit, 74.5% Polyester 24.5% Wool, 240 g/m2Polartec® Power Dry® fabric is designed to keep you dry and warm during aerobic activity. It features a patented bi-component knit construction that uses wool yarns on the face and polyester next to skin. This creates two different surfaces: one that is optimized to move moisture away from the skin, the other to dry quickly and maintain warmth. As a bluesign® approved textile, it has met the most stringent of sustainable production standards. 74.5% Polyester/25.5% Wool, 240 g/m2.