The very best way we've found to fend off brain freeze. This genius beanie is stuffed with high-fluff 650 fill power goose down – arguably nature’s most effective insulator, providing near-weightless insulation that's so warm it's darn near transcendent. This lofty down is captured in a quilted ripstop shell that shuts out icy gusts and resists mist. And when a sudden thaw sets in, you can stuff the beanie in its own compact pocket and tuck it in a tiny corner of your pack, at your fingertips when the temperature plummets.