The Boreal Windstopper Beanie is the warmest hat in our Waterfowl line, ideal for long blind sessions at extreme latitudes. The 100% windproof WINDSTOPPER shell protects your forehead and dome, but is left out over the ears for uninhibited hearing. The remarkably soft Berber liner and 60g/m2 Primaloft Silver Insulation throughout lock in warmth.