Designed for extreme conditions, the Frostline Hat is built for ultimate winter weather protection. Water-resistant, ultralight 30d Pertex Endurance fabric keeps out the elements, while Posh Pile fleece provides warm, wicking insulation. A zip-out face mask and fleece-lined earflaps provide adjustable protection from biting wind and snow, and the foam brim snaps up for greater visibility when you' Water resistant. Wind resistant. Breathable. Wicking. Ear flaps. Fold-out facemask. Foam-stiffened brim. Brim folds up and secures with magnets to the crown. External drawcord adjustment.