Polartec Power Dry keeps the skin dry through three complementary mechanisms. The fabric is highly breathable and does not restrict the movement of moisture vapour. "Touch points" on the fabric inner surface draw off the sweat. Sweat is wicked off the skin to the outside of the fabric where it spreads rapidly for evaporation. Polartec Power Dry fabrics move at least 30% more moisture away from the skin than single component fabrics. When the sweat reaches the outside of the fabric, it spreads out to many times its original surface area, enabling it to dry at least 2 times faster than cotton.