Montbell Men's Wickron ZEO T Short Sleeve Shirt - Gunmetal Orange RedWickron Zeo products are year round work horses for those that are not deterred by cold weather forecasts. Whether used as a base layer or mid layer in your backcountry kit the Zip Shirt provides a measure of wind protection and heat retention due to the densely knitted antibacterial fabric. The conjugated fibers utilized in the knit keep you comfortable by absorbing moisture and moving it away from your skin to the face of the fabric for evaporation.