Cut from the same fabric as the Jetstream Jacket, the Jetstream Beanie is ideal for charging up steep faces in bitter cold, or sitting motionless on a windy ridge top. A lofted micro-grid fleece backer delivers warmth, while the WINDSTOPPER® membrane blocks drafts from your dome and forehead. A four-way stretch, air-permeable band warms the back of your neck and ears without impeding hearing.