CoolPass is an eternal high-performance functional polyesterfiber. The ditches informed by the specific “cross (x) section” speeds up the moisture absorption and diffusion. Fabrics from Cool Pass obtain excellent comfort in wear with dry, soft and breathable. The layer of Cool Pass gives an extra practical advantage. Machine-wash at 40 degrees C and dry over and over again without losing shape. A very practical and functional undergarment when increased physical activity is expected.