Crafts new Pro Zero Extreme merges two of our most battle hardened fabrics, Pro Zero and Pro Cool, into the most effective base layer yet. Pro Zero stays in contact with your body, pulling excess moisture away from your skin, while simultaneously keeping you warm. Pro Cool outer fabric allows air to circulate around your body and further promote moisture expulsion. proZEROextreme also features an antimicrobial treatment to prevent fabric odor from setting in. Guaranteed to be the best fitting, best performing and most comfortable base layer yet.