Howling arctic winds and below freezing temperatures have nothing on the Outdoor Research Frostline Hat. The Frostline's Pertex Endurance fabric resists moisture, while its Posh Pile fleece lining insulates and wicks moisture. The zip-out face mask keeps your face covered when any amount of exposed skin could result in frostbite, and the external drawcord keeps the hat firmly in place as you weather another gnarly winter storm.