The Thermolator 2.0 Half-Zip Top is the ideal piece for all day warmth and comfort while being out in the elements. This versatile thermal piece features an ultra-soft, midweight fabric utilizing our ClimaSense Thermoregulation Technology that automatically adjusts to your body temperature. It does this by trapping air to maintain warmth when your body starts to cool down. When your aerobic activity increases and your skin temperature rises, the fabric allows moisture vapor to escape to maintain comfort.Whether skiing, mountaineering, fat biking, snowshoeing or winter running, Thermolator is functional performance at its best! The Mens Thermolator 2.0 Crew Neck Top goes perfectly with the Mens Thermolator 2.0 Pant and other pieces from the Thermolator collection.FEATURESUltra-soft brushed fabric surface traps air to maintain warmthMidweight warmth (2.0) makesThermolator extremely versatile 4-way stretch for ease of movementUPF rating 25+Functional thu