Like a thermostat for your body, you dial in the temp in this men's PRC half zip. Unzip the mock neck to cool off. Zip it up and use the thumbholes on the sleeves for a convenient thermal fit. Quick-drying waffle geomesh tech fabric makes this piece excellent as a standalone shirt or a baselayer. Wear it for walking, running, cross-country skiing, or just sipping cocoa in your chalet. Makes a thoughtful gift he'll use almost all year in the PNW.