If you're familiar with the popular SITKA Jetstream Jacket, you know that it's perfect for fighting against biting wind and cold. The SITKA Jetstream Beanie makes sure your head equally stays in the game while trudging up an exposed ridge or glassing across the valley. A lofted micro-grid fleece interior supplies warmth, while the GORE-TEX INFINIUM with WINDSTOPPER membrane keeps out drafts and retains heat where you need it most, your head.