Craft's New Pro Zero Extreme merges two of the most battled hardened fabrices, 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. Overall the Pro Zero Extreme will keep your core temp at the perfect level by pulling moisture from your skin, removing excess body heat and continually circulating air around your body.