The heavyweight Under Armour Men's Coldgear Infrared Evo CG 14 Zip Top brings the warmth to the frigid days at the ski resort. Made out of polyester and elastane, this baselayer offers a comfortable amount of stretch along with Under Armour's signature ColdGear Infrared printed interior, which reflects your heat back to you for a surprising amount of warmth. Under Armour also added an antimicrobial treatment to combat odors and a Moisture Transport System that keeps you drier when you're working up a sweat. Its fitted design makes this top excellent as a baselayer, but you could also wear it as a midlayer during the coldest days of the year. A 14 zip front gives you some ventilation in case you overheat, and flatlock seams provide a chafe free fit.