The Zenith Top is a superbly balanced mid-layer providing key insulation, moisture-wicking, body temperature regulation. This is THE GO-TO TOP for all conditions, all situations. The Zenith is light, warm, tough and breathes well when the heat comes on. It utilizes a 280gm RPET recycled polyester hard-faced, high wicking fleece. The high collar protects from the harsh sun and cold wind.